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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 | /* $Id$ */ | |
17 | ||
18 | //____________________________________________________________________ | |
19 | // This is a class that constructs ReconstParticles (reconstructed | |
20 | // particles) out of Digits | |
21 | // | |
22 | // | |
23 | // This class reads either digits from a TClonesArray or raw data from | |
24 | // a DDL file (or similar), and stores the read ADC counts in an | |
25 | // internal cache (fAdcs). | |
26 | // | |
27 | // From the cached values it then calculates the number of particles | |
28 | // that hit a region of the FMDs, as specified by the user. | |
29 | // | |
30 | // The reconstruction can be done in two ways: Either via counting the | |
31 | // number of empty strips (Poisson method), or by converting the ADC | |
32 | // signal to an energy deposition, and then dividing by the typical | |
33 | // energy loss of a particle. | |
34 | // | |
35 | // Currently, this class only reads the digits from a TClonesArray, | |
36 | // and the Poission method for reconstruction. | |
37 | // | |
38 | // | |
39 | //-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia | |
40 | // Latest changes by Christian Holm Christensen <cholm@nbi.dk> | |
41 | // | |
42 | // | |
43 | //____________________________________________________________________ | |
44 | ||
45 | #include "AliFMD.h" | |
46 | #include "AliFMDDigit.h" | |
47 | #include "AliFMDParticles.h" | |
48 | #include "AliFMDReconstructor.h" | |
49 | #include "AliAltroBuffer.h" | |
50 | #include "AliLog.h" | |
51 | #include "AliRun.h" | |
52 | #include "AliRunLoader.h" | |
53 | #include "AliLoader.h" | |
54 | #include "AliHeader.h" | |
55 | #include "AliGenEventHeader.h" | |
56 | #include "AliFMDRawStream.h" | |
57 | #include "AliRawReader.h" | |
58 | ||
59 | //____________________________________________________________________ | |
60 | ClassImp(AliFMDReconstructor); | |
61 | ||
62 | //____________________________________________________________________ | |
63 | AliFMDReconstructor::AliFMDReconstructor() | |
64 | : AliReconstructor(), | |
65 | fAdcs(kMaxDetectors, kMaxRings, kMaxSectors, kMaxStrips), | |
66 | fDeltaEta(0), | |
67 | fDeltaPhi(0), | |
68 | fThreshold(0), | |
69 | fPedestal(0), | |
70 | fPedestalWidth(0) | |
71 | { | |
72 | SetDeltaEta(); | |
73 | SetDeltaPhi(); | |
74 | SetThreshold(); | |
75 | SetPedestal(); | |
76 | ||
77 | fParticles = new TClonesArray("AliFMDParticles", 1000); | |
78 | fFMDLoader = 0; | |
79 | fRunLoader = 0; | |
80 | fFMD = 0; | |
81 | } | |
82 | ||
83 | //____________________________________________________________________ | |
84 | void | |
85 | AliFMDReconstructor::SetPedestal(Float_t mean, Float_t width) | |
86 | { | |
87 | // Set the pedestal, and pedestal width | |
88 | fPedestal = mean; | |
89 | fPedestalWidth = width; | |
90 | } | |
91 | ||
92 | //____________________________________________________________________ | |
93 | void | |
94 | AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader, | |
95 | AliRawReader* rawReader) const | |
96 | { | |
97 | // Collects all digits in the same active volume into number of | |
98 | // particles | |
99 | // | |
100 | // Reconstruct number of particles in given group of pads for given | |
101 | // FMDvolume determined by numberOfVolume, | |
102 | // numberOfMinSector, numberOfMaxSector, numberOfMinRing, | |
103 | // numberOgMaxRing | |
104 | // | |
105 | // The reconstruction method is choosen based on the number of empty | |
106 | // strips. | |
107 | fParticles->Clear(); | |
108 | if (!runLoader) { | |
109 | Error("Exec","Run Loader loader is NULL - Session not opened"); | |
110 | return; | |
111 | } | |
112 | fRunLoader = runLoader; | |
113 | fFMDLoader = runLoader->GetLoader("FMDLoader"); | |
114 | if (!fFMDLoader) | |
115 | Fatal("AliFMDReconstructor","Can not find FMD (loader) " | |
116 | "in specified event"); | |
117 | ||
118 | // Get the AliRun object | |
119 | if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice(); | |
120 | ||
121 | // Get the AliFMD object | |
122 | fFMD = static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD")); | |
123 | if (!fFMD) { | |
124 | AliError("Can not get FMD from gAlice"); | |
125 | return; | |
126 | } | |
127 | fFMDLoader->LoadRecPoints("RECREATE"); | |
128 | ||
129 | if (!fRunLoader->TreeE()) fRunLoader->LoadHeader(); | |
130 | ||
131 | TClonesArray* digits = fFMD->Digits(); | |
132 | if (rawReader) { | |
133 | Int_t event = 0; | |
134 | while (rawReader->NextEvent()) { | |
135 | ProcessEvent(event, rawReader, digits); | |
136 | event++; | |
137 | } | |
138 | } | |
139 | else { | |
140 | Int_t nEvents= Int_t(fRunLoader->TreeE()->GetEntries()); | |
141 | for(Int_t event = 0; event < nEvents; event++) | |
142 | ProcessEvent(event, 0, digits); | |
143 | } | |
144 | ||
145 | ||
146 | fFMDLoader->UnloadRecPoints(); | |
147 | fFMDLoader = 0; | |
148 | fRunLoader = 0; | |
149 | fFMD = 0; | |
150 | } | |
151 | ||
152 | //____________________________________________________________________ | |
153 | void | |
154 | AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader) const | |
155 | { | |
156 | // Collects all digits in the same active volume into number of | |
157 | // particles | |
158 | // | |
159 | // Reconstruct number of particles in given group of pads for given | |
160 | // FMDvolume determined by numberOfVolume, | |
161 | // numberOfMinSector, numberOfMaxSector, numberOfMinRing, | |
162 | // numberOgMaxRing | |
163 | // | |
164 | // The reconstruction method is choosen based on the number of empty | |
165 | // strips. | |
166 | Reconstruct(runLoader, 0); | |
167 | } | |
168 | ||
169 | ||
170 | //____________________________________________________________________ | |
171 | void | |
172 | AliFMDReconstructor::ProcessEvent(Int_t event, | |
173 | AliRawReader* reader, | |
174 | TClonesArray* digits) const | |
175 | { | |
176 | fRunLoader->GetEvent(event) ; | |
177 | //event z-vertex for correction eta-rad dependence | |
178 | AliHeader *header = fRunLoader->GetHeader(); | |
179 | if (!header) | |
180 | Warning("ProcessEvent", "no AliHeader found!"); | |
181 | AliGenEventHeader* genHeader = (header ? header->GenEventHeader() : 0); | |
182 | ||
183 | // Get the Z--coordinate from the event header | |
184 | TArrayF o(3); | |
185 | if (genHeader) genHeader->PrimaryVertex(o); | |
186 | Float_t zVertex = o.At(2); | |
187 | ||
188 | // If the recontruction tree isn't loaded, load it | |
189 | if(fFMDLoader->TreeR()==0) fFMDLoader->MakeTree("R"); | |
190 | ||
191 | //Make branches to hold the reconstructed particles | |
192 | const Int_t kBufferSize = 16000; | |
193 | fFMDLoader->TreeR()->Branch("FMD", &fParticles, kBufferSize); | |
194 | ||
195 | // Load or recreate the digits | |
196 | if (fFMDLoader->LoadDigits((reader ? "UPDATE" : "READ"))) { | |
197 | if (!reader) { | |
198 | Error("Exec","Error occured while loading digits. Exiting."); | |
199 | return; | |
200 | } | |
201 | ||
202 | } | |
203 | // Get the digits tree | |
204 | TTree* digitTree = fFMDLoader->TreeD(); | |
205 | if (!digitTree) { | |
206 | if (!reader) { | |
207 | Error("Exec","Can not get Tree with Digits. " | |
208 | "Nothing to reconstruct - Exiting"); | |
209 | return; | |
210 | } | |
211 | fFMDLoader->MakeTree("D"); | |
212 | digitTree = fFMDLoader->TreeD(); | |
213 | ||
214 | } | |
215 | // Get the FMD branch holding the digits. | |
216 | TBranch *digitBranch = digitTree->GetBranch("FMD"); | |
217 | if (!digitBranch) { | |
218 | if (!reader) { | |
219 | Error("Exec", "No digit branch for the FMD found"); | |
220 | return; | |
221 | } | |
222 | fFMD->MakeBranchInTree(digitTree, fFMD->GetName(), &(digits), 4000, 0); | |
223 | } | |
224 | if (!reader) digitBranch->SetAddress(&digits); | |
225 | ||
226 | fEmptyStrips = 0; | |
227 | fTotalStrips = 0; | |
228 | Bool_t ok = kFALSE; | |
229 | if (reader) ok = ReadAdcs(reader); | |
230 | else if (digits) ok = ReadAdcs(digits); | |
231 | if (!ok) return; | |
232 | ||
233 | ReconstructFromCache(zVertex); | |
234 | ||
235 | if (reader) { | |
236 | digitTree->Fill(); | |
237 | fFMDLoader->WriteDigits("OVERWRITE"); | |
238 | } | |
239 | fFMDLoader->UnloadDigits(); | |
240 | fFMDLoader->TreeR()->Reset(); | |
241 | fFMDLoader->TreeR()->Fill(); | |
242 | fFMDLoader->WriteRecPoints("OVERWRITE"); | |
243 | } | |
244 | ||
245 | //____________________________________________________________________ | |
246 | Bool_t | |
247 | AliFMDReconstructor::ReadAdcs(TClonesArray* digits) const | |
248 | { | |
249 | AliDebug(10, "Reading ADCs from Digits array"); | |
250 | // read Digits, and reconstruct the particles | |
251 | if (!fFMDLoader->TreeD()->GetEvent(0)) return kFALSE; | |
252 | ||
253 | // Reads the digits from the array, and fills up the cache (fAdcs) | |
254 | fAdcs.Clear(); | |
255 | Int_t nDigits = digits->GetEntries(); | |
256 | for (Int_t digit = 0; digit < nDigits; digit++) { | |
257 | AliFMDDigit* fmdDigit = | |
258 | static_cast<AliFMDDigit*>(digits->UncheckedAt(digit)); | |
259 | ||
260 | ProcessDigit(fmdDigit); | |
261 | } //digit loop | |
262 | return kTRUE; | |
263 | } | |
264 | ||
265 | //____________________________________________________________________ | |
266 | Bool_t | |
267 | AliFMDReconstructor::ReadAdcs(AliRawReader* reader) const | |
268 | { | |
269 | AliDebug(10, "Reading ADCs from RawReader"); | |
270 | // Reads the digits from a RAW data | |
271 | fAdcs.Clear(); | |
272 | // reader->Reset(); | |
273 | ||
274 | if (!reader->ReadHeader()) { | |
275 | Error("ReadAdcs", "Couldn't read header"); | |
276 | return kFALSE; | |
277 | } | |
278 | ||
279 | // Use AliAltroRawStream to read the ALTRO format. No need to | |
280 | // reinvent the wheel :-) | |
281 | AliFMDRawStream input(reader); | |
282 | // Select FMD DDL's | |
283 | reader->Select(AliFMD::kBaseDDL >> 8); | |
284 | ||
285 | Int_t oldDDL = -1; | |
286 | Int_t count = 0; | |
287 | UShort_t detector = 1; // Must be one here | |
288 | UShort_t oldDetector = 0; | |
289 | // Loop over data in file | |
290 | Bool_t next = kTRUE; | |
291 | ||
292 | // local Cache | |
293 | TArrayI counts(10); | |
294 | counts.Reset(-1); | |
295 | Int_t offset = 0; | |
296 | ||
297 | while (next) { | |
298 | next = input.Next(); | |
299 | ||
300 | ||
301 | count++; | |
302 | Int_t ddl = reader->GetDDLID(); | |
303 | if (ddl != oldDDL | |
304 | || input.IsNewStrip() | |
305 | || !next) { | |
306 | // Make a new digit, if we have some data! | |
307 | if (counts[0] >= 0) { | |
308 | // Got a new strip. | |
309 | AliDebug(10, Form("Add a new strip: FMD%d%c[%2d,%3d] " | |
310 | "(current: FMD%d%c[%2d,%3d])", | |
311 | oldDetector, input.PrevRing(), | |
312 | input.PrevSector() , input.PrevStrip(), | |
313 | detector , input.Ring(), input.Sector(), | |
314 | input.Strip())); | |
315 | fFMD->AddDigit(oldDetector, | |
316 | input.PrevRing(), | |
317 | input.PrevSector(), | |
318 | input.PrevStrip(), | |
319 | counts[0], counts[1], counts[2]); | |
320 | AliFMDDigit* digit = | |
321 | static_cast<AliFMDDigit*>(fFMD->Digits()-> | |
322 | UncheckedAt(fFMD->GetNdigits()-1)); | |
323 | ProcessDigit(digit); | |
324 | } | |
325 | ||
326 | if (!next) { | |
327 | AliDebug(10, Form("Read %d channels for FMD%d", | |
328 | count + 1, detector)); | |
329 | break; | |
330 | } | |
331 | ||
332 | ||
333 | // If we got a new DDL, it means we have a new detector. | |
334 | if (ddl != oldDDL) { | |
335 | if (detector != 0) | |
336 | AliDebug(10, Form("Read %d channels for FMD%d", | |
337 | count + 1, detector)); | |
338 | // Reset counts, and update the DDL cache | |
339 | count = 0; | |
340 | oldDDL = ddl; | |
341 | // Check that we're processing a FMD detector | |
342 | Int_t detId = reader->GetDetectorID(); | |
343 | if (detId != (AliFMD::kBaseDDL >> 8)) { | |
344 | Error("ReadAdcs", "Detector ID %d != %d", | |
345 | detId, (AliFMD::kBaseDDL >> 8)); | |
346 | break; | |
347 | } | |
348 | // Figure out what detector we're deling with | |
349 | oldDetector = detector; | |
350 | switch (ddl) { | |
351 | case 0: detector = 1; break; | |
352 | case 1: detector = 2; break; | |
353 | case 2: detector = 3; break; | |
354 | default: | |
355 | Error("ReadAdcs", "Unknown DDL 0x%x for FMD", ddl); | |
356 | return kFALSE; | |
357 | } | |
358 | AliDebug(10, Form("Reading ADCs for 0x%x - That is FMD%d", | |
359 | reader->GetEquipmentId(), detector)); | |
360 | } | |
361 | counts.Reset(-1); | |
362 | offset = 0; | |
363 | } | |
364 | ||
365 | counts[offset] = input.Count(); | |
366 | offset++; | |
367 | ||
368 | AliDebug(10, Form("ADC of FMD%d%c[%2d,%3d] += %d", | |
369 | detector, input.Ring(), input.Sector(), | |
370 | input.Strip(), input.Count())); | |
371 | oldDetector = detector; | |
372 | } | |
373 | return kTRUE; | |
374 | } | |
375 | ||
376 | //____________________________________________________________________ | |
377 | void | |
378 | AliFMDReconstructor::ProcessDigit(AliFMDDigit* digit) const | |
379 | { | |
380 | // Process a digit. Derived classes can overload this member | |
381 | // function to do stuff to the digit. However, it should write the | |
382 | // ADC count to the internal cache | |
383 | // | |
384 | // fAdcs(detector - 1, ring, sector, strip) = counts; | |
385 | // | |
386 | // In this implementation, we count the number of strips below | |
387 | // threshold. This we do to later choose what kind of | |
388 | // reconstruction algorithm we'd like to use. | |
389 | // | |
390 | UShort_t detector = digit->Detector(); | |
391 | Char_t ring = digit->Ring(); | |
392 | UShort_t sector = digit->Sector(); | |
393 | UShort_t strip = digit->Strip(); | |
394 | ||
395 | UShort_t counts = SubtractPedestal(digit); | |
396 | ||
397 | fAdcs(detector - 1, ring, sector, strip) = counts; | |
398 | if (counts < fThreshold) fEmptyStrips++; | |
399 | fTotalStrips++; | |
400 | } | |
401 | ||
402 | //____________________________________________________________________ | |
403 | UShort_t | |
404 | AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const | |
405 | { | |
406 | // Member function to subtract the pedestal from a digit | |
407 | // This implementation does nothing, but a derived class could over | |
408 | // load this to subtract a pedestal that was given in a database or | |
409 | // something like that. | |
410 | ||
411 | Int_t counts = | |
412 | TMath::Max(Int_t(digit->Count1() - fPedestal - 3 * fPedestalWidth), 0); | |
413 | if (digit->Count2() >= 0) | |
414 | counts += | |
415 | TMath::Max(Int_t(digit->Count2() - fPedestal - 3 * fPedestalWidth), 0); | |
416 | if (digit->Count3() >= 0) | |
417 | counts += | |
418 | TMath::Max(Int_t(digit->Count3() - fPedestal - 3 * fPedestalWidth), 0); | |
419 | ||
420 | if (counts < 0) counts = 0; | |
421 | return UShort_t(counts); | |
422 | } | |
423 | ||
424 | //____________________________________________________________________ | |
425 | void | |
426 | AliFMDReconstructor::ReconstructFromCache(Float_t zVertex) const | |
427 | { | |
428 | // Based on the information in the cache, do the reconstruction. | |
429 | Int_t nRecon = 0; | |
430 | // Loop over the detectors | |
431 | for (Int_t i = 1; i <= 3; i++) { | |
432 | AliFMDSubDetector* sub = 0; | |
433 | switch (i) { | |
434 | case 1: sub = fFMD->GetFMD1(); break; | |
435 | case 2: sub = fFMD->GetFMD2(); break; | |
436 | case 3: sub = fFMD->GetFMD3(); break; | |
437 | } | |
438 | if (!sub) continue; | |
439 | ||
440 | // Loop over the rings in the detector | |
441 | for (Int_t j = 0; j < 2; j++) { | |
442 | Float_t rZ = 0; | |
443 | AliFMDRing* r = 0; | |
444 | switch (j) { | |
445 | case 0: r = sub->GetInner(); rZ = sub->GetInnerZ(); break; | |
446 | case 1: r = sub->GetOuter(); rZ = sub->GetOuterZ(); break; | |
447 | } | |
448 | if (!r) continue; | |
449 | ||
450 | // Calculate low/high theta and eta | |
451 | // FIXME: Is this right? | |
452 | Float_t realZ = zVertex + rZ; | |
453 | Float_t thetaOut = TMath::ATan2(r->GetHighR(), realZ); | |
454 | Float_t thetaIn = TMath::ATan2(r->GetLowR(), realZ); | |
455 | Float_t etaOut = - TMath::Log(TMath::Tan(thetaOut / 2)); | |
456 | Float_t etaIn = - TMath::Log(TMath::Tan(thetaIn / 2)); | |
457 | if (TMath::Abs(etaOut) > TMath::Abs(etaIn)) { | |
458 | Float_t tmp = etaIn; | |
459 | etaIn = etaOut; | |
460 | etaOut = tmp; | |
461 | } | |
462 | ||
463 | //------------------------------------------------------------- | |
464 | // | |
465 | // Here starts poisson method | |
466 | // | |
467 | // Calculate eta step per strip, number of eta steps, number of | |
468 | // phi steps, and check the sign of the eta increment | |
469 | Float_t stripEta = (Float_t(r->GetNStrips()) / (etaIn - etaOut)); | |
470 | Int_t nEta = Int_t(TMath::Abs(etaIn - etaOut) / fDeltaEta); | |
471 | Int_t nPhi = Int_t(360. / fDeltaPhi); | |
472 | Float_t sign = TMath::Sign(Float_t(1.), etaIn); | |
473 | ||
474 | AliDebug(10, Form("FMD%d%c Eta range: %f, %f %d Phi steps", | |
475 | sub->GetId(), r->GetId(), etaOut, etaIn, nPhi)); | |
476 | ||
477 | // Loop over relevant phi values | |
478 | for (Int_t p = 0; p < nPhi; p++) { | |
479 | Float_t minPhi = p * fDeltaPhi; | |
480 | Float_t maxPhi = minPhi + fDeltaPhi; | |
481 | UShort_t minSector = UShort_t(minPhi / 360) * r->GetNSectors(); | |
482 | UShort_t maxSector = UShort_t(maxPhi / 360) * r->GetNSectors(); | |
483 | ||
484 | AliDebug(10, Form(" Now in phi range %f, %f (sectors %d,%d)", | |
485 | minPhi, maxPhi, minSector, maxSector)); | |
486 | // Loop over relevant eta values | |
487 | for (Int_t e = nEta; e >= 0; --e) { | |
488 | Float_t maxEta = etaIn - sign * e * fDeltaEta; | |
489 | Float_t minEta = maxEta - sign * fDeltaEta; | |
490 | if (sign > 0) minEta = TMath::Max(minEta, etaOut); | |
491 | else minEta = TMath::Min(minEta, etaOut); | |
492 | Float_t theta1 = 2 * TMath::ATan(TMath::Exp(-minEta)); | |
493 | Float_t theta2 = 2 * TMath::ATan(TMath::Exp(-maxEta)); | |
494 | Float_t minR = TMath::Abs(realZ * TMath::Tan(theta2)); | |
495 | Float_t maxR = TMath::Abs(realZ * TMath::Tan(theta1)); | |
496 | UShort_t minStrip = UShort_t((etaIn - maxEta) * stripEta + 0.5); | |
497 | UShort_t maxStrip = UShort_t((etaIn - minEta) * stripEta + 0.5); | |
498 | ||
499 | AliDebug(10, Form(" Now in eta range %f, %f (strips %d, %d)\n" | |
500 | " [radii %f, %f, thetas %f, %f, sign %d]", | |
501 | minEta, maxEta, minStrip, maxStrip, | |
502 | minR, maxR, theta1, theta2, sign)); | |
503 | ||
504 | // Count number of empty strips | |
505 | Int_t emptyStrips = 0; | |
506 | for (Int_t sector = minSector; sector < maxSector; sector++) | |
507 | for (Int_t strip = minStrip; strip < maxStrip; strip++) | |
508 | if (fAdcs(sub->GetId() - 1, r->GetId(), sector, strip) | |
509 | < fThreshold) emptyStrips++; | |
510 | ||
511 | // The total number of strips | |
512 | Float_t nTotal = (maxSector - minSector) * (maxStrip - minStrip); | |
513 | ||
514 | // Log ratio of empty to total number of strips | |
515 | AliDebug(10, Form("Lambda= %d / %d = %f", | |
516 | emptyStrips, nTotal, | |
517 | Float_t(emptyStrips) / nTotal)); | |
518 | ||
519 | Double_t lambda = (emptyStrips > 0 ? | |
520 | - TMath::Log(Double_t(emptyStrips) / nTotal) : | |
521 | 1); | |
522 | ||
523 | // The reconstructed number of particles is then given by | |
524 | Int_t reconstructed = Int_t(lambda * nTotal + 0.5); | |
525 | ||
526 | // Add a AliFMDParticles to the reconstruction tree. | |
527 | new((*fParticles)[nRecon]) | |
528 | AliFMDParticles(sub->GetId(), r->GetId(), | |
529 | minSector, maxSector, minStrip, maxStrip, | |
530 | minEta, maxEta, minPhi, maxPhi, | |
531 | reconstructed, AliFMDParticles::kPoission); | |
532 | nRecon++; | |
533 | } // phi | |
534 | } // eta | |
535 | } // ring | |
536 | } // detector | |
537 | } | |
538 | ||
539 | ||
540 | //____________________________________________________________________ | |
541 | void | |
542 | AliFMDReconstructor::FillESD(AliRunLoader* /*fRunLoader*/, | |
543 | AliESD* /*esd*/) const | |
544 | { | |
545 | // nothing to be done | |
546 | ||
547 | } | |
548 |