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37c55dc0 | 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 | **************************************************************************/ | |
0d0e6995 | 15 | /* $Id$ */ |
c2fc1258 | 16 | /** @file AliFMDReconstructor.cxx |
17 | @author Christian Holm Christensen <cholm@nbi.dk> | |
18 | @date Mon Mar 27 12:47:09 2006 | |
19 | @brief FMD reconstruction | |
20 | */ | |
4347b38f | 21 | //____________________________________________________________________ |
42403906 | 22 | // |
02a27b50 | 23 | // This is a class that constructs AliFMDRecPoint objects from of Digits |
6169f936 | 24 | // This class reads either digits from a TClonesArray or raw data from |
4347b38f | 25 | // a DDL file (or similar), and stores the read ADC counts in an |
6169f936 | 26 | // internal cache (fAdcs). The rec-points are made via the naiive |
27 | // method. | |
4347b38f | 28 | // |
37c55dc0 | 29 | //-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia |
4347b38f | 30 | // Latest changes by Christian Holm Christensen <cholm@nbi.dk> |
31 | // | |
32 | // | |
33 | //____________________________________________________________________ | |
37c55dc0 | 34 | |
56b1929b | 35 | #include <AliLog.h> // ALILOG_H |
6169f936 | 36 | // #include <AliRun.h> // ALIRUN_H |
56b1929b | 37 | #include <AliRunLoader.h> // ALIRUNLOADER_H |
56b1929b | 38 | #include <AliHeader.h> // ALIHEADER_H |
56b1929b | 39 | #include <AliGenEventHeader.h> // ALIGENEVENTHEADER_H |
1a1fdef7 | 40 | #include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H |
41 | #include "AliFMDParameters.h" // ALIFMDPARAMETERS_H | |
56b1929b | 42 | #include "AliFMDDigit.h" // ALIFMDDIGIT_H |
43 | #include "AliFMDReconstructor.h" // ALIFMDRECONSTRUCTOR_H | |
56b1929b | 44 | #include "AliFMDRawReader.h" // ALIFMDRAWREADER_H |
bf000c32 | 45 | #include "AliFMDRecPoint.h" // ALIFMDMULTNAIIVE_H |
a3537838 | 46 | #include "AliESD.h" // ALIESD_H |
8f6ee336 | 47 | #include <AliESDFMD.h> // ALIESDFMD_H |
02a27b50 | 48 | class AliRawReader; |
4347b38f | 49 | |
50 | //____________________________________________________________________ | |
925e6570 | 51 | ClassImp(AliFMDReconstructor) |
1a1fdef7 | 52 | #if 0 |
53 | ; // This is here to keep Emacs for indenting the next line | |
54 | #endif | |
37c55dc0 | 55 | |
4347b38f | 56 | //____________________________________________________________________ |
57 | AliFMDReconstructor::AliFMDReconstructor() | |
58 | : AliReconstructor(), | |
e9fd1e20 | 59 | fMult(0x0), |
60 | fNMult(0), | |
61 | fTreeR(0x0), | |
62 | fCurrentVertex(0), | |
63 | fESDObj(0x0), | |
64 | fESD(0x0) | |
4347b38f | 65 | { |
8f6ee336 | 66 | // Make a new FMD reconstructor object - default CTOR. |
a9579262 | 67 | SetNoiseFactor(); |
68 | SetAngleCorrect(); | |
4347b38f | 69 | } |
70 | ||
42403906 | 71 | |
72 | //____________________________________________________________________ | |
73 | AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other) | |
8f6ee336 | 74 | : AliReconstructor(), |
75 | fMult(other.fMult), | |
e9fd1e20 | 76 | fNMult(other.fNMult), |
77 | fTreeR(other.fTreeR), | |
78 | fCurrentVertex(other.fCurrentVertex), | |
79 | fESDObj(other.fESDObj), | |
a9579262 | 80 | fESD(other.fESD), |
81 | fNoiseFactor(other.fNoiseFactor), | |
82 | fAngleCorrect(other.fAngleCorrect) | |
42403906 | 83 | { |
56b1929b | 84 | // Copy constructor |
42403906 | 85 | } |
86 | ||
87 | ||
88 | //____________________________________________________________________ | |
89 | AliFMDReconstructor& | |
90 | AliFMDReconstructor::operator=(const AliFMDReconstructor& other) | |
91 | { | |
56b1929b | 92 | // Assignment operator |
a9579262 | 93 | fMult = other.fMult; |
94 | fNMult = other.fNMult; | |
95 | fTreeR = other.fTreeR; | |
e9fd1e20 | 96 | fCurrentVertex = other.fCurrentVertex; |
a9579262 | 97 | fESDObj = other.fESDObj; |
98 | fESD = other.fESD; | |
99 | fNoiseFactor = other.fNoiseFactor; | |
100 | fAngleCorrect = other.fAngleCorrect; | |
101 | ||
42403906 | 102 | return *this; |
103 | } | |
56b1929b | 104 | |
105 | //____________________________________________________________________ | |
106 | AliFMDReconstructor::~AliFMDReconstructor() | |
107 | { | |
108 | // Destructor | |
8f6ee336 | 109 | if (fMult) fMult->Delete(); |
110 | if (fMult) delete fMult; | |
111 | if (fESDObj) delete fESDObj; | |
56b1929b | 112 | } |
4347b38f | 113 | |
114 | //____________________________________________________________________ | |
115 | void | |
1a1fdef7 | 116 | AliFMDReconstructor::Init(AliRunLoader* runLoader) |
117 | { | |
118 | // Initialize the reconstructor | |
119 | AliDebug(1, Form("Init called with runloader 0x%x", runLoader)); | |
bf000c32 | 120 | // Initialize the geometry |
9b48326f | 121 | AliFMDGeometry* geom = AliFMDGeometry::Instance(); |
122 | geom->Init(); | |
123 | geom->InitTransformations(); | |
124 | ||
125 | // Initialize the parameters | |
126 | AliFMDParameters* param = AliFMDParameters::Instance(); | |
127 | param->Init(); | |
bf000c32 | 128 | |
8f6ee336 | 129 | // Current vertex position |
1a1fdef7 | 130 | fCurrentVertex = 0; |
8f6ee336 | 131 | // Create array of reconstructed strip multiplicities |
bf000c32 | 132 | fMult = new TClonesArray("AliFMDRecPoint", 51200); |
8f6ee336 | 133 | // Create ESD output object |
134 | fESDObj = new AliESDFMD; | |
135 | ||
136 | // Check that we have a run loader | |
1a1fdef7 | 137 | if (!runLoader) { |
138 | Warning("Init", "No run loader"); | |
4347b38f | 139 | return; |
140 | } | |
8f6ee336 | 141 | |
142 | // Check if we can get the header tree | |
1a1fdef7 | 143 | AliHeader* header = runLoader->GetHeader(); |
144 | if (!header) { | |
145 | Warning("Init", "No header"); | |
4347b38f | 146 | return; |
147 | } | |
8f6ee336 | 148 | |
149 | // Check if we can get a simulation header | |
1a1fdef7 | 150 | AliGenEventHeader* eventHeader = header->GenEventHeader(); |
a3537838 | 151 | if (eventHeader) { |
152 | TArrayF vtx; | |
153 | eventHeader->PrimaryVertex(vtx); | |
154 | fCurrentVertex = vtx[2]; | |
155 | AliDebug(1, Form("Primary vertex Z coordinate for event # %d/%d is %f", | |
156 | header->GetRun(), header->GetEvent(), fCurrentVertex)); | |
157 | Warning("Init", "no generator event header"); | |
158 | } | |
159 | else { | |
160 | Warning("Init", "No generator event header - " | |
161 | "perhaps we get the vertex from ESD?"); | |
4347b38f | 162 | } |
4347b38f | 163 | } |
dc8af42e | 164 | |
4347b38f | 165 | //____________________________________________________________________ |
166 | void | |
1a1fdef7 | 167 | AliFMDReconstructor::ConvertDigits(AliRawReader* reader, |
168 | TTree* digitsTree) const | |
169 | { | |
170 | // Convert Raw digits to AliFMDDigit's in a tree | |
8f6ee336 | 171 | AliDebug(1, "Reading raw data into digits tree"); |
1a1fdef7 | 172 | AliFMDRawReader rawRead(reader, digitsTree); |
173 | // rawRead.SetSampleRate(fFMD->GetSampleRate()); | |
174 | rawRead.Exec(); | |
4347b38f | 175 | } |
176 | ||
4347b38f | 177 | //____________________________________________________________________ |
178 | void | |
1a1fdef7 | 179 | AliFMDReconstructor::Reconstruct(TTree* digitsTree, |
180 | TTree* clusterTree) const | |
4347b38f | 181 | { |
1a1fdef7 | 182 | // Reconstruct event from digits in tree |
4347b38f | 183 | // Get the FMD branch holding the digits. |
69b696b9 | 184 | // FIXME: The vertex may not be known yet, so we may have to move |
185 | // some of this to FillESD. | |
1a1fdef7 | 186 | AliDebug(1, "Reconstructing from digits in a tree"); |
1e8f773e | 187 | #if 1 |
a3537838 | 188 | if (fESD) { |
8f6ee336 | 189 | const AliESDVertex* vertex = fESD->GetVertex(); |
190 | if (vertex) { | |
191 | AliDebug(1, Form("Got vertex from ESD: %f", vertex->GetZv())); | |
192 | fCurrentVertex = vertex->GetZv(); | |
193 | } | |
a3537838 | 194 | } |
54e415a8 | 195 | #endif |
1a1fdef7 | 196 | TBranch *digitBranch = digitsTree->GetBranch("FMD"); |
4347b38f | 197 | if (!digitBranch) { |
1a1fdef7 | 198 | Error("Exec", "No digit branch for the FMD found"); |
199 | return; | |
4347b38f | 200 | } |
0abe7182 | 201 | TClonesArray* digits = new TClonesArray("AliFMDDigit"); |
1a1fdef7 | 202 | digitBranch->SetAddress(&digits); |
4347b38f | 203 | |
8f6ee336 | 204 | if (fMult) fMult->Clear(); |
205 | if (fESDObj) fESDObj->Clear(); | |
206 | ||
207 | fNMult = 0; | |
208 | fTreeR = clusterTree; | |
209 | fTreeR->Branch("FMD", &fMult); | |
210 | ||
211 | AliDebug(5, "Getting entry 0 from digit branch"); | |
1a1fdef7 | 212 | digitBranch->GetEntry(0); |
213 | ||
8f6ee336 | 214 | AliDebug(5, "Processing digits"); |
e802be3e | 215 | ProcessDigits(digits); |
216 | ||
8f6ee336 | 217 | Int_t written = clusterTree->Fill(); |
218 | AliDebug(10, Form("Filled %d bytes into cluster tree", written)); | |
0abe7182 | 219 | digits->Delete(); |
220 | delete digits; | |
4347b38f | 221 | } |
1a1fdef7 | 222 | |
8f6ee336 | 223 | |
4347b38f | 224 | //____________________________________________________________________ |
e802be3e | 225 | void |
226 | AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const | |
4347b38f | 227 | { |
69b696b9 | 228 | // For each digit, find the pseudo rapdity, azimuthal angle, and |
229 | // number of corrected ADC counts, and pass it on to the algorithms | |
230 | // used. | |
e802be3e | 231 | Int_t nDigits = digits->GetEntries(); |
1a1fdef7 | 232 | AliDebug(1, Form("Got %d digits", nDigits)); |
a9579262 | 233 | fESDObj->SetNoiseFactor(fNoiseFactor); |
234 | fESDObj->SetAngleCorrected(fAngleCorrect); | |
e802be3e | 235 | for (Int_t i = 0; i < nDigits; i++) { |
236 | AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i)); | |
8f6ee336 | 237 | AliFMDParameters* param = AliFMDParameters::Instance(); |
238 | // Check that the strip is not marked as dead | |
239 | if (param->IsDead(digit->Detector(), digit->Ring(), | |
15b17c89 | 240 | digit->Sector(), digit->Strip())) { |
241 | AliDebug(10, Form("FMD%d%c[%2d,%3d] is dead", digit->Detector(), | |
242 | digit->Ring(), digit->Sector(), digit->Strip())); | |
243 | continue; | |
244 | } | |
8f6ee336 | 245 | |
246 | // digit->Print(); | |
247 | // Get eta and phi | |
248 | Float_t eta, phi; | |
249 | PhysicalCoordinates(digit, eta, phi); | |
4347b38f | 250 | |
8f6ee336 | 251 | // Substract pedestal. |
e802be3e | 252 | UShort_t counts = SubtractPedestal(digit); |
4347b38f | 253 | |
8f6ee336 | 254 | // Gain match digits. |
255 | Double_t edep = Adc2Energy(digit, eta, counts); | |
256 | ||
257 | // Make rough multiplicity | |
258 | Double_t mult = Energy2Multiplicity(digit, edep); | |
259 | ||
260 | AliDebug(10, Form("FMD%d%c[%2d,%3d]: " | |
261 | "ADC: %d, Counts: %d, Energy: %f, Mult: %f", | |
262 | digit->Detector(), digit->Ring(), digit->Sector(), | |
263 | digit->Strip(), digit->Counts(), counts, edep, mult)); | |
264 | ||
265 | // Create a `RecPoint' on the output branch. | |
bf000c32 | 266 | AliFMDRecPoint* m = |
267 | new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(), | |
268 | digit->Ring(), | |
269 | digit->Sector(), | |
270 | digit->Strip(), | |
271 | eta, phi, | |
272 | edep, mult); | |
8f6ee336 | 273 | (void)m; // Suppress warnings about unused variables. |
274 | fNMult++; | |
275 | ||
276 | fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(), | |
277 | digit->Sector(), digit->Strip(), mult); | |
278 | fESDObj->SetEta(digit->Detector(), digit->Ring(), | |
279 | digit->Sector(), digit->Strip(), eta); | |
4347b38f | 280 | } |
4347b38f | 281 | } |
8f6ee336 | 282 | |
1a1fdef7 | 283 | //____________________________________________________________________ |
284 | UShort_t | |
285 | AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const | |
286 | { | |
287 | // Member function to subtract the pedestal from a digit | |
288 | // This implementation does nothing, but a derived class could over | |
289 | // load this to subtract a pedestal that was given in a database or | |
290 | // something like that. | |
291 | ||
8f6ee336 | 292 | Int_t counts = 0; |
293 | AliFMDParameters* param = AliFMDParameters::Instance(); | |
a9579262 | 294 | Float_t ped = param->GetPedestal(digit->Detector(), |
8f6ee336 | 295 | digit->Ring(), |
296 | digit->Sector(), | |
297 | digit->Strip()); | |
a9579262 | 298 | Float_t noise = param->GetPedestalWidth(digit->Detector(), |
299 | digit->Ring(), | |
300 | digit->Sector(), | |
301 | digit->Strip()); | |
15b17c89 | 302 | AliDebug(15, Form("Subtracting pedestal %f from signal %d", |
a9579262 | 303 | ped, digit->Counts())); |
1a1fdef7 | 304 | if (digit->Count3() > 0) counts = digit->Count3(); |
305 | else if (digit->Count2() > 0) counts = digit->Count2(); | |
306 | else counts = digit->Count1(); | |
a9579262 | 307 | counts = TMath::Max(Int_t(counts - ped), 0); |
308 | if (counts < noise * fNoiseFactor) counts = 0; | |
15b17c89 | 309 | if (counts > 0) AliDebug(15, "Got a hit strip"); |
8f6ee336 | 310 | |
1a1fdef7 | 311 | return UShort_t(counts); |
312 | } | |
313 | ||
8f6ee336 | 314 | //____________________________________________________________________ |
315 | Float_t | |
316 | AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit, | |
a9579262 | 317 | Float_t eta, |
8f6ee336 | 318 | UShort_t count) const |
319 | { | |
320 | // Converts number of ADC counts to energy deposited. | |
321 | // Note, that this member function can be overloaded by derived | |
322 | // classes to do strip-specific look-ups in databases or the like, | |
323 | // to find the proper gain for a strip. | |
324 | // | |
325 | // In this simple version, we calculate the energy deposited as | |
326 | // | |
327 | // EnergyDeposited = cos(theta) * gain * count | |
328 | // | |
329 | // where | |
330 | // | |
331 | // Pre_amp_MIP_Range | |
332 | // gain = ----------------- * Energy_deposited_per_MIP | |
333 | // ADC_channel_size | |
334 | // | |
335 | // is constant and the same for all strips. | |
336 | ||
a9579262 | 337 | if (count <= 0) return 0; |
8f6ee336 | 338 | AliFMDParameters* param = AliFMDParameters::Instance(); |
339 | Float_t gain = param->GetPulseGain(digit->Detector(), | |
340 | digit->Ring(), | |
341 | digit->Sector(), | |
342 | digit->Strip()); | |
15b17c89 | 343 | AliDebug(15, Form("Converting counts %d to energy via factor %f", |
8f6ee336 | 344 | count, gain)); |
a9579262 | 345 | |
346 | Double_t edep = count * gain; | |
347 | if (fAngleCorrect) { | |
348 | Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta)); | |
349 | edep *= TMath::Abs(TMath::Cos(theta)); | |
350 | } | |
8f6ee336 | 351 | return edep; |
352 | } | |
353 | ||
354 | //____________________________________________________________________ | |
355 | Float_t | |
356 | AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */, | |
357 | Float_t edep) const | |
358 | { | |
359 | // Converts an energy signal to number of particles. | |
360 | // Note, that this member function can be overloaded by derived | |
361 | // classes to do strip-specific look-ups in databases or the like, | |
362 | // to find the proper gain for a strip. | |
363 | // | |
364 | // In this simple version, we calculate the multiplicity as | |
365 | // | |
366 | // multiplicity = Energy_deposited / Energy_deposited_per_MIP | |
367 | // | |
368 | // where | |
369 | // | |
370 | // Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness | |
371 | // | |
372 | // is constant and the same for all strips | |
373 | AliFMDParameters* param = AliFMDParameters::Instance(); | |
374 | Double_t edepMIP = param->GetEdepMip(); | |
375 | Float_t mult = edep / edepMIP; | |
376 | if (edep > 0) | |
15b17c89 | 377 | AliDebug(15, Form("Translating energy %f to multiplicity via " |
8f6ee336 | 378 | "divider %f->%f", edep, edepMIP, mult)); |
379 | return mult; | |
380 | } | |
381 | ||
382 | //____________________________________________________________________ | |
383 | void | |
384 | AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit, | |
385 | Float_t& eta, | |
386 | Float_t& phi) const | |
387 | { | |
388 | // Get the eta and phi of a digit | |
389 | // | |
390 | // Get geometry. | |
9b48326f | 391 | AliFMDGeometry* geom = AliFMDGeometry::Instance(); |
bf000c32 | 392 | Double_t x, y, z, r, theta; |
9b48326f | 393 | geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(), |
bf000c32 | 394 | digit->Strip(), x, y, z); |
395 | // Correct for vertex offset. | |
396 | z += fCurrentVertex; | |
397 | phi = TMath::ATan2(y, x); | |
398 | r = TMath::Sqrt(y * y + x * x); | |
399 | theta = TMath::ATan2(r, z); | |
400 | eta = -TMath::Log(TMath::Tan(theta / 2)); | |
8f6ee336 | 401 | } |
402 | ||
403 | ||
404 | ||
4347b38f | 405 | //____________________________________________________________________ |
406 | void | |
1a1fdef7 | 407 | AliFMDReconstructor::FillESD(TTree* /* digitsTree */, |
408 | TTree* /* clusterTree */, | |
8f6ee336 | 409 | AliESD* esd) const |
121a60bd | 410 | { |
42403906 | 411 | // nothing to be done |
69b696b9 | 412 | // FIXME: The vertex may not be known when Reconstruct is executed, |
413 | // so we may have to move some of that member function here. | |
8f6ee336 | 414 | AliDebug(1, Form("Calling FillESD with two trees and one ESD")); |
415 | // fESDObj->Print(); | |
416 | ||
417 | if (esd) { | |
418 | AliDebug(1, Form("Writing FMD data to ESD tree")); | |
419 | esd->SetFMDData(fESDObj); | |
a3537838 | 420 | } |
121a60bd | 421 | } |
422 | ||
54e415a8 | 423 | |
424 | //____________________________________________________________________ | |
425 | void | |
426 | AliFMDReconstructor::Reconstruct(AliRawReader*,TTree*) const | |
427 | { | |
428 | // Cannot be used. See member function with same name but with 2 | |
429 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 430 | AliDebug(1, Form("Calling FillESD with loader and tree")); |
54e415a8 | 431 | AliError("MayNotUse"); |
432 | } | |
433 | //____________________________________________________________________ | |
434 | void | |
435 | AliFMDReconstructor::Reconstruct(AliRunLoader*) const | |
436 | { | |
437 | // Cannot be used. See member function with same name but with 2 | |
438 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 439 | AliDebug(1, Form("Calling FillESD with loader")); |
54e415a8 | 440 | AliError("MayNotUse"); |
441 | } | |
442 | //____________________________________________________________________ | |
443 | void | |
444 | AliFMDReconstructor::Reconstruct(AliRunLoader*, AliRawReader*) const | |
445 | { | |
446 | // Cannot be used. See member function with same name but with 2 | |
447 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 448 | AliDebug(1, Form("Calling FillESD with loader and raw reader")); |
54e415a8 | 449 | AliError("MayNotUse"); |
450 | } | |
451 | //____________________________________________________________________ | |
452 | void | |
453 | AliFMDReconstructor::FillESD(AliRawReader*,TTree*,AliESD*) const | |
454 | { | |
455 | // Cannot be used. See member function with same name but with 2 | |
456 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 457 | AliDebug(1, Form("Calling FillESD with raw reader, tree, and ESD")); |
54e415a8 | 458 | AliError("MayNotUse"); |
459 | } | |
460 | //____________________________________________________________________ | |
461 | void | |
462 | AliFMDReconstructor::FillESD(AliRunLoader*,AliESD*) const | |
463 | { | |
464 | // Cannot be used. See member function with same name but with 2 | |
465 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 466 | AliDebug(1, Form("Calling FillESD with loader and ESD")); |
54e415a8 | 467 | AliError("MayNotUse"); |
468 | } | |
469 | //____________________________________________________________________ | |
470 | void | |
471 | AliFMDReconstructor::FillESD(AliRunLoader*,AliRawReader*,AliESD*) const | |
472 | { | |
473 | // Cannot be used. See member function with same name but with 2 | |
474 | // TTree arguments. Make sure you do local reconstrucion | |
8f6ee336 | 475 | AliDebug(1, Form("Calling FillESD with loader, raw reader, and ESD")); |
54e415a8 | 476 | AliError("MayNotUse"); |
477 | } | |
478 | ||
42403906 | 479 | //____________________________________________________________________ |
480 | // | |
481 | // EOF | |
482 | // |