TRD/AliTRDclusterizerV1.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /*
  17 $Log$
  18 Revision 1.18  2002/10/14 14:57:43  hristov
  19 Merging the VirtualMC branch to the main development branch (HEAD)
  20
  21 Revision 1.15.6.2  2002/07/24 10:09:30  alibrary
  22 Updating VirtualMC
  23
  24 Revision 1.17  2002/06/12 09:54:35  cblume
  25 Update of tracking code provided by Sergei
  26
  27 Revision 1.16  2002/03/25 20:01:30  cblume
  28 Introduce parameter class
  29
  30 Revision 1.15  2001/11/14 12:09:11  cblume
  31 Use correct name for digitizer
  32
  33 Revision 1.14  2001/11/14 10:50:45  cblume
  34 Changes in digits IO. Add merging of summable digits
  35
  36 Revision 1.13  2001/05/28 17:07:58  hristov
  37 Last minute changes; ExB correction in AliTRDclusterizerV1; taking into account of material in G10 TEC frames and material between TEC planes (C.Blume,S.Sedykh)
  38
  39 Revision 1.12  2001/05/21 17:42:58  hristov
  40 Constant casted to avoid the ambiguity
  41
  42 Revision 1.11  2001/05/21 16:45:47  hristov
  43 Last minute changes (C.Blume)
  44
  45 Revision 1.10  2001/05/07 08:06:44  cblume
  46 Speedup of the code. Create only AliTRDcluster
  47
  48 Revision 1.9  2000/11/01 14:53:20  cblume
  49 Merge with TRD-develop
  50
  51 Revision 1.1.4.5  2000/10/15 23:40:01  cblume
  52 Remove AliTRDconst
  53
  54 Revision 1.1.4.4  2000/10/06 16:49:46  cblume
  55 Made Getters const
  56
  57 Revision 1.1.4.3  2000/10/04 16:34:58  cblume
  58 Replace include files by forward declarations
  59
  60 Revision 1.1.4.2  2000/09/22 14:49:49  cblume
  61 Adapted to tracking code
  62
  63 Revision 1.8  2000/10/02 21:28:19  fca
  64 Removal of useless dependecies via forward declarations
  65
  66 Revision 1.7  2000/06/27 13:08:50  cblume
  67 Changed to Copy(TObject &A) to appease the HP-compiler
  68
  69 Revision 1.6  2000/06/09 11:10:07  cblume
  70 Compiler warnings and coding conventions, next round
  71
  72 Revision 1.5  2000/06/08 18:32:58  cblume
  73 Make code compliant to coding conventions
  74
  75 Revision 1.4  2000/06/07 16:27:01  cblume
  76 Try to remove compiler warnings on Sun and HP
  77
  78 Revision 1.3  2000/05/08 16:17:27  cblume
  79 Merge TRD-develop
  80
  81 Revision 1.1.4.1  2000/05/08 15:09:01  cblume
  82 Introduce AliTRDdigitsManager
  83
  84 Revision 1.1  2000/02/28 18:58:54  cblume
  85 Add new TRD classes
  86
  87 */
  88
  89 ///////////////////////////////////////////////////////////////////////////////
  90 //                                                                           //
  91 // TRD cluster finder for the slow simulator.
  92 //                                                                           //
  93 ///////////////////////////////////////////////////////////////////////////////
  94
  95 #include <TF1.h>
  96 #include <TTree.h>
  97 #include <TH1.h>
  98 #include <TFile.h>
  99
 100 #include "AliRun.h"
 101
 102 #include "AliTRD.h"
 103 #include "AliTRDclusterizerV1.h"
 104 #include "AliTRDmatrix.h"
 105 #include "AliTRDgeometry.h"
 106 #include "AliTRDdigitizer.h"
 107 #include "AliTRDdataArrayF.h"
 108 #include "AliTRDdataArrayI.h"
 109 #include "AliTRDdigitsManager.h"
 110 #include "AliTRDparameter.h"
 111
 112 ClassImp(AliTRDclusterizerV1)
 113
 114 //_____________________________________________________________________________
 115 AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer()
 116 {
 117   //
 118   // AliTRDclusterizerV1 default constructor
 119   //
 120
 121   fDigitsManager = 0;
 122
 123 }
 124
 125 //_____________________________________________________________________________
 126 AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title)
 127                     :AliTRDclusterizer(name,title)
 128 {
 129   //
 130   // AliTRDclusterizerV1 default constructor
 131   //
 132
 133   fDigitsManager = new AliTRDdigitsManager();
 134   fDigitsManager->CreateArrays();
 135
 136 }
 137
 138 //_____________________________________________________________________________
 139 AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
 140 {
 141   //
 142   // AliTRDclusterizerV1 copy constructor
 143   //
 144
 145   ((AliTRDclusterizerV1 &) c).Copy(*this);
 146
 147 }
 148
 149 //_____________________________________________________________________________
 150 AliTRDclusterizerV1::~AliTRDclusterizerV1()
 151 {
 152   //
 153   // AliTRDclusterizerV1 destructor
 154   //
 155
 156   if (fDigitsManager) {
 157     delete fDigitsManager;
 158     fDigitsManager = NULL;
 159   }
 160
 161 }
 162
 163 //_____________________________________________________________________________
 164 AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
 165 {
 166   //
 167   // Assignment operator
 168   //
 169
 170   if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
 171   return *this;
 172
 173 }
 174
 175 //_____________________________________________________________________________
 176 void AliTRDclusterizerV1::Copy(TObject &c)
 177 {
 178   //
 179   // Copy function
 180   //
 181
 182   ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
 183
 184   AliTRDclusterizer::Copy(c);
 185
 186 }
 187
 188 //_____________________________________________________________________________
 189 Bool_t AliTRDclusterizerV1::ReadDigits()
 190 {
 191   //
 192   // Reads the digits arrays from the input aliroot file
 193   //
 194
 195   if (!fInputFile) {
 196     printf("<AliTRDclusterizerV1::ReadDigits> ");
 197     printf("No input file open\n");
 198     return kFALSE;
 199   }
 200
 201   fDigitsManager->Open(fInputFile->GetName());
 202   fDigitsManager->SetEvent(fEvent);
 203
 204   // Read in the digit arrays
 205   return (fDigitsManager->ReadDigits());
 206
 207 }
 208
 209 //_____________________________________________________________________________
 210 Bool_t AliTRDclusterizerV1::MakeClusters()
 211 {
 212   //
 213   // Generates the cluster.
 214   //
 215
 216   Int_t row, col, time;
 217
 218   if (fTRD->IsVersion() != 1) {
 219     printf("<AliTRDclusterizerV1::MakeCluster> ");
 220     printf("TRD must be version 1 (slow simulator).\n");
 221     return kFALSE;
 222   }
 223
 224   // Get the geometry
 225   AliTRDgeometry *geo = fTRD->GetGeometry();
 226
 227   // Create a default parameter class if none is defined
 228   if (!fPar) {
 229     fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
 230     printf("<AliTRDclusterizerV1::MakeCluster> ");
 231     printf("Create the default parameter object.\n");
 232   }
 233
 234   Float_t timeBinSize = fPar->GetTimeBinSize();
 235   // Half of ampl.region
 236   const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.;
 237
 238   Float_t omegaTau = fPar->GetOmegaTau();
 239   if (fVerbose > 0) {
 240     printf("<AliTRDclusterizerV1::MakeCluster> ");
 241     printf("OmegaTau = %f \n",omegaTau);
 242     printf("<AliTRDclusterizerV1::MakeCluster> ");
 243     printf("Start creating clusters.\n");
 244   }
 245
 246   AliTRDdataArrayI *digits;
 247   AliTRDdataArrayI *track0;
 248   AliTRDdataArrayI *track1;
 249   AliTRDdataArrayI *track2;
 250
 251   // Threshold value for the maximum
 252   Int_t maxThresh = fPar->GetClusMaxThresh();
 253   // Threshold value for the digit signal
 254   Int_t sigThresh = fPar->GetClusSigThresh();
 255
 256   // Iteration limit for unfolding procedure
 257   const Float_t kEpsilon = 0.01;
 258
 259   const Int_t   kNclus   = 3;
 260   const Int_t   kNsig    = 5;
 261   const Int_t   kNtrack  = 3 * kNclus;
 262
 263   Int_t   iType          = 0;
 264   Int_t   iUnfold        = 0;
 265
 266   Float_t ratioLeft      = 1.0;
 267   Float_t ratioRight     = 1.0;
 268
 269   Float_t padSignal[kNsig];
 270   Float_t clusterSignal[kNclus];
 271   Float_t clusterPads[kNclus];
 272   Int_t   clusterDigit[kNclus];
 273   Int_t   clusterTracks[kNtrack];
 274
 275   Int_t chamBeg = 0;
 276   Int_t chamEnd = AliTRDgeometry::Ncham();
 277   if (fTRD->GetSensChamber()  >= 0) {
 278     chamBeg = fTRD->GetSensChamber();
 279     chamEnd = chamBeg + 1;
 280   }
 281   Int_t planBeg = 0;
 282   Int_t planEnd = AliTRDgeometry::Nplan();
 283   if (fTRD->GetSensPlane()    >= 0) {
 284     planBeg = fTRD->GetSensPlane();
 285     planEnd = planBeg + 1;
 286   }
 287   Int_t sectBeg = 0;
 288   Int_t sectEnd = AliTRDgeometry::Nsect();
 289
 290   // Start clustering in every chamber
 291   for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
 292     for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
 293       for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
 294
 295         if (fTRD->GetSensSector() >= 0) {
 296           Int_t sens1 = fTRD->GetSensSector();
 297           Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
 298           sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
 299                  * AliTRDgeometry::Nsect();
 300           if (sens1 < sens2) {
 301             if ((isect < sens1) || (isect >= sens2)) continue;
 302           }
 303           else {
 304             if ((isect < sens1) && (isect >= sens2)) continue;
 305           }
 306         }
 307
 308         Int_t idet = geo->GetDetector(iplan,icham,isect);
 309
 310         Int_t nClusters      = 0;
 311         Int_t nClusters2pad  = 0;
 312         Int_t nClusters3pad  = 0;
 313         Int_t nClusters4pad  = 0;
 314         Int_t nClusters5pad  = 0;
 315         Int_t nClustersLarge = 0;
 316
 317         if (fVerbose > 0) {
 318           printf("<AliTRDclusterizerV1::MakeCluster> ");
 319           printf("Analyzing chamber %d, plane %d, sector %d.\n"
 320                 ,icham,iplan,isect);
 321         }
 322
 323         Int_t   nRowMax     = fPar->GetRowMax(iplan,icham,isect);
 324         Int_t   nColMax     = fPar->GetColMax(iplan);
 325         Int_t   nTimeBefore = fPar->GetTimeBefore();
 326         Int_t   nTimeTotal  = fPar->GetTimeTotal();
 327
 328         Float_t row0        = fPar->GetRow0(iplan,icham,isect);
 329         Float_t col0        = fPar->GetCol0(iplan);
 330         Float_t rowSize     = fPar->GetRowPadSize(iplan,icham,isect);
 331         Float_t colSize     = fPar->GetColPadSize(iplan);
 332
 333         // Get the digits
 334         digits = fDigitsManager->GetDigits(idet);
 335         digits->Expand();
 336         track0 = fDigitsManager->GetDictionary(idet,0);
 337         track0->Expand();
 338         track1 = fDigitsManager->GetDictionary(idet,1);
 339         track1->Expand();
 340         track2 = fDigitsManager->GetDictionary(idet,2);
 341         track2->Expand();
 342
 343         // Loop through the chamber and find the maxima
 344         for ( row = 0;  row <  nRowMax;    row++) {
 345           for ( col = 2;  col <  nColMax;    col++) {
 346             for (time = 0; time < nTimeTotal; time++) {
 347
 348               Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col  ,time));
 349               Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time));
 350               Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 351
 352               // Look for the maximum
 353               if (signalM >= maxThresh) {
 354                 if (((signalL >= sigThresh) &&
 355                      (signalL <  signalM))  ||
 356                     ((signalR >= sigThresh) &&
 357                      (signalR <  signalM))) {
 358                   // Maximum found, mark the position by a negative signal
 359                   digits->SetDataUnchecked(row,col-1,time,-signalM);
 360                 }
 361               }
 362
 363             }
 364           }
 365         }
 366
 367         // Now check the maxima and calculate the cluster position
 368         for ( row = 0;  row <  nRowMax  ;  row++) {
 369           for (time = 0; time < nTimeTotal; time++) {
 370             for ( col = 1;  col <  nColMax-1;  col++) {
 371
 372               // Maximum found ?
 373               if (digits->GetDataUnchecked(row,col,time) < 0) {
 374
 375                 Int_t iPad;
 376                 for (iPad = 0; iPad < kNclus; iPad++) {
 377                   Int_t iPadCol = col - 1 + iPad;
 378                   clusterSignal[iPad]     = TMath::Abs(digits->GetDataUnchecked(row
 379                                                                                ,iPadCol
 380                                                                                ,time));
 381                   clusterDigit[iPad]      = digits->GetIndexUnchecked(row,iPadCol,time);
 382                   clusterTracks[3*iPad  ] = track0->GetDataUnchecked(row,iPadCol,time) - 1;
 383                   clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1;
 384                   clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1;
 385                 }
 386
 387                 // Count the number of pads in the cluster
 388                 Int_t nPadCount = 0;
 389                 Int_t ii        = 0;
 390                 while (TMath::Abs(digits->GetDataUnchecked(row,col-ii  ,time))
 391                                                                   >= sigThresh) {
 392                   nPadCount++;
 393                   ii++;
 394                   if (col-ii   <        0) break;
 395                 }
 396                 ii = 0;
 397                 while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time))
 398                                                                   >= sigThresh) {
 399                   nPadCount++;
 400                   ii++;
 401                   if (col+ii+1 >= nColMax) break;
 402                 }
 403
 404                 nClusters++;
 405                 switch (nPadCount) {
 406                 case 2:
 407                   iType = 0;
 408                   nClusters2pad++;
 409                   break;
 410                 case 3:
 411                   iType = 1;
 412                   nClusters3pad++;
 413                   break;
 414                 case 4:
 415                   iType = 2;
 416                   nClusters4pad++;
 417                   break;
 418                 case 5:
 419                   iType = 3;
 420                   nClusters5pad++;
 421                   break;
 422                 default:
 423                   iType = 4;
 424                   nClustersLarge++;
 425                   break;
 426                 };
 427
 428                 // Don't analyze large clusters
 429                 //if (iType == 4) continue;
 430
 431                 // Look for 5 pad cluster with minimum in the middle
 432                 Bool_t fivePadCluster = kFALSE;
 433                 if (col < nColMax-3) {
 434                   if (digits->GetDataUnchecked(row,col+2,time) < 0) {
 435                     fivePadCluster = kTRUE;
 436                   }
 437                   if ((fivePadCluster) && (col < nColMax-5)) {
 438                     if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) {
 439                       fivePadCluster = kFALSE;
 440                     }
 441                   }
 442                   if ((fivePadCluster) && (col >         1)) {
 443                     if (digits->GetDataUnchecked(row,col-2,time) >= sigThresh) {
 444                       fivePadCluster = kFALSE;
 445                     }
 446                   }
 447                 }
 448
 449                 // 5 pad cluster
 450                 // Modify the signal of the overlapping pad for the left part
 451                 // of the cluster which remains from a previous unfolding
 452                 if (iUnfold) {
 453                   clusterSignal[0] *= ratioLeft;
 454                   iType   = 3;
 455                   iUnfold = 0;
 456                 }
 457
 458                 // Unfold the 5 pad cluster
 459                 if (fivePadCluster) {
 460                   for (iPad = 0; iPad < kNsig; iPad++) {
 461                     padSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row
 462                                                                          ,col-1+iPad
 463                                                                          ,time));
 464                   }
 465                   // Unfold the two maxima and set the signal on
 466                   // the overlapping pad to the ratio
 467                   ratioRight        = Unfold(kEpsilon,iplan,padSignal);
 468                   ratioLeft         = 1.0 - ratioRight;
 469                   clusterSignal[2] *= ratioRight;
 470                   iType   = 3;
 471                   iUnfold = 1;
 472                 }
 473
 474                 Float_t clusterCharge = clusterSignal[0]
 475                                       + clusterSignal[1]
 476                                       + clusterSignal[2];
 477
 478                 // The position of the cluster
 479                 clusterPads[0] = row + 0.5;
 480                 // Take the shift of the additional time bins into account
 481                 clusterPads[2] = time - nTimeBefore + 0.5;
 482
 483                 if (fPar->LUTOn()) {
 484
 485                   // Calculate the position of the cluster by using the
 486                   // lookup table method
 487                   clusterPads[1] = col + 0.5
 488                                  + fPar->LUTposition(iplan,clusterSignal[0]
 489                                                           ,clusterSignal[1]
 490                                                           ,clusterSignal[2]);
 491
 492                 }
 493                 else {
 494
 495                   // Calculate the position of the cluster by using the
 496                   // center of gravity method
 497                   clusterPads[1] = col + 0.5
 498                                  + (clusterSignal[2] - clusterSignal[0])
 499                                  / clusterCharge;
 500
 501                 }
 502
 503                 Float_t q0 = clusterSignal[0];
 504                 Float_t q1 = clusterSignal[1];
 505                 Float_t q2 = clusterSignal[2];
 506                 Float_t clusterSigmaY2 = (q1*(q0+q2)+4*q0*q2) /
 507                                          (clusterCharge*clusterCharge);
 508
 509                 // Correct for ExB displacement
 510                 if (fPar->ExBOn()) {
 511                   Int_t   local_time_bin = (Int_t) clusterPads[2];
 512                   Float_t driftLength    = local_time_bin * timeBinSize + kAmWidth;
 513                   Float_t colSize        = fPar->GetColPadSize(iplan);
 514                   Float_t deltaY         = omegaTau*driftLength/colSize;
 515                   clusterPads[1]         = clusterPads[1] - deltaY;
 516                 }
 517
 518                 if (fVerbose > 1) {
 519                   printf("-----------------------------------------------------------\n");
 520                   printf("Create cluster no. %d\n",nClusters);
 521                   printf("Position: row = %f, col = %f, time = %f\n",clusterPads[0]
 522                                                                     ,clusterPads[1]
 523                                                                     ,clusterPads[2]);
 524                   printf("Indices: %d, %d, %d\n",clusterDigit[0]
 525                                                 ,clusterDigit[1]
 526                                                 ,clusterDigit[2]);
 527                   printf("Total charge = %f\n",clusterCharge);
 528                   printf("Tracks: pad0 %d, %d, %d\n",clusterTracks[0]
 529                                                     ,clusterTracks[1]
 530                                                     ,clusterTracks[2]);
 531                   printf("        pad1 %d, %d, %d\n",clusterTracks[3]
 532                                                     ,clusterTracks[4]
 533                                                     ,clusterTracks[5]);
 534                   printf("        pad2 %d, %d, %d\n",clusterTracks[6]
 535                                                     ,clusterTracks[7]
 536                                                     ,clusterTracks[8]);
 537                   printf("Type = %d, Number of pads = %d\n",iType,nPadCount);
 538                 }
 539
 540                 // Calculate the position and the error
 541                 Float_t clusterPos[3];
 542                 clusterPos[0] = clusterPads[1] * colSize + col0;
 543                 clusterPos[1] = clusterPads[0] * rowSize + row0;
 544                 clusterPos[2] = clusterPads[2];
 545                 Float_t clusterSig[2];
 546                 clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize;
 547                 clusterSig[1] = rowSize * rowSize / 12.;
 548
 549                 // Add the cluster to the output array
 550                 fTRD->AddCluster(clusterPos
 551                                 ,idet
 552                                 ,clusterCharge
 553                                 ,clusterTracks
 554                                 ,clusterSig
 555                                 ,iType);
 556
 557               }
 558             }
 559           }
 560         }
 561
 562         // Compress the arrays
 563         digits->Compress(1,0);
 564         track0->Compress(1,0);
 565         track1->Compress(1,0);
 566         track2->Compress(1,0);
 567
 568         // Write the cluster and reset the array
 569         WriteClusters(idet);
 570         fTRD->ResetRecPoints();
 571
 572         if (fVerbose > 0) {
 573           printf("<AliTRDclusterizerV1::MakeCluster> ");
 574           printf("Found %d clusters in total.\n"
 575                 ,nClusters);
 576           printf("                                    2pad:  %d\n",nClusters2pad);
 577           printf("                                    3pad:  %d\n",nClusters3pad);
 578           printf("                                    4pad:  %d\n",nClusters4pad);
 579           printf("                                    5pad:  %d\n",nClusters5pad);
 580           printf("                                    Large: %d\n",nClustersLarge);
 581         }
 582
 583       }
 584     }
 585   }
 586
 587   if (fVerbose > 0) {
 588     printf("<AliTRDclusterizerV1::MakeCluster> ");
 589     printf("Done.\n");
 590   }
 591
 592   return kTRUE;
 593
 594 }
 595
 596 //_____________________________________________________________________________
 597 Float_t AliTRDclusterizerV1::Unfold(Float_t eps, Int_t plane, Float_t* padSignal)
 598 {
 599   //
 600   // Method to unfold neighbouring maxima.
 601   // The charge ratio on the overlapping pad is calculated
 602   // until there is no more change within the range given by eps.
 603   // The resulting ratio is then returned to the calling method.
 604   //
 605
 606   Int_t   irc               = 0;
 607   Int_t   itStep            = 0;      // Count iteration steps
 608
 609   Float_t ratio             = 0.5;    // Start value for ratio
 610   Float_t prevRatio         = 0;      // Store previous ratio
 611
 612   Float_t newLeftSignal[3]  = {0};    // Array to store left cluster signal
 613   Float_t newRightSignal[3] = {0};    // Array to store right cluster signal
 614   Float_t newSignal[3]      = {0};
 615
 616   // Start the iteration
 617   while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
 618
 619     itStep++;
 620     prevRatio = ratio;
 621
 622     // Cluster position according to charge ratio
 623     Float_t maxLeft  = (ratio*padSignal[2] - padSignal[0])
 624                      / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
 625     Float_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
 626                      / ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
 627
 628     // Set cluster charge ratio
 629     irc = fPar->PadResponse(1.0,maxLeft ,plane,newSignal);
 630     Float_t ampLeft  = padSignal[1] / newSignal[1];
 631     irc = fPar->PadResponse(1.0,maxRight,plane,newSignal);
 632     Float_t ampRight = padSignal[3] / newSignal[1];
 633
 634     // Apply pad response to parameters
 635     irc = fPar->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
 636     irc = fPar->PadResponse(ampRight,maxRight,plane,newRightSignal);
 637
 638     // Calculate new overlapping ratio
 639     ratio = TMath::Min((Float_t)1.0,newLeftSignal[2] /
 640                           (newLeftSignal[2] + newRightSignal[0]));
 641
 642   }
 643
 644   return ratio;
 645
 646 }
 647