class AliCaloCellsQA: public TObject

 Default constructor (for root I/O). Do not use it.

 Allows to set main class parameters.

 nmods -- maximum supermodule number + 1:
   use 4 for EMCAL <= 2010;
   use 4 for PHOS (PHOS numbers start from 1, not from zero);
   use 10 for EMCAL >= 2011.

 det -- detector: AliCaloCellsQA::kEMCAL or AliCaloCellsQA::kPHOS.
   Note: DCAL not yet implemented.

 startRunNumber, endRunNumber -- run range the analysis will run on
   (to allow later merging); wide (but reasonable) range can be provided.

 Activate initialization and filling of all the designed histograms.
 Must be called before InitSummaryHistograms() and Fill() methods, if necessary.

 Initialize summary (not per run) histograms.
 Must be called after ActivateFullAnalysis(), before calling Fill() method, if necessary.

 nbins, emax -- number of bins and maximum amplitude for fhCellAmplitude and fhCellAmplitudeNonLocMax;
 nbinsh, emaxh -- number of bins and maximum amplitude for fhCellAmplitudeEhigh and fhCellAmplitudeEhighNonLocMax;
 nbinst, tmin, tmax -- number of bins and minimum/maximum time for fhCellTime.

 Does the job: fills histograms for current event.

 runNumber -- current run number;
 clusArray -- array of clusters (TObjArray or TClonesArray);
 cells -- EMCAL or PHOS cells;
 vertexXYZ -- primary vertex position.

 Set cuts for minimum cluster energies.
 Must be called before calling Fill() method, if necessary.

 Set binning parameters for histograms hECells, hNCellsInCluster and hPi0Mass.
 Must be called before Fill() method, if necessary.

 nbins1, xmax1 -- number of bins and maximum X axis value for hECells;
 nbins2, xmax2 -- number of bins and maximum X axis value for hPi0Mass;
 nbins3x, nbins3y, xmax3 -- number of bins in X and Y axes and maximum X axis value for hNCellsInCluster.

 Class initialization.
 Defaults: fClusElowMin = 0.3GeV, fClusEhighMin = 1GeV, fPi0EClusMin = 0.5GeV, fkFullAnalysis = false.

 Initialize transient members, add a new run if necessary.

 Initializes transient data members -- references to histograms
 (e.g. in case the class was restored from a file);
 run -- current run number.

 Initialize per run histograms for a new run number;
 run -- run number.

 Fill histograms related to a cluster

 Fill cell histograms not related with a cluster

 Fill gamma+gamma invariant mass histograms.
 ri -- run index.

 Apply common cluster cuts and return supermodule number on success.
 Return -1 if cuts not passed or an error occured.

 Convert cell absId --> supermodule number. Return -1 in case of error.
 Note: we use simple and straightforward way to find supermodule number.
 This allows to avoid unnecessary external dependencies (on geometry).

 Returns true if cell is a local maximum in cluster (clusterizer dependent).
 Cell fractions are taken into account.

 c -- cell number in the cluster.

 Returns true if cell is a local maximum among cells (clusterizer independent).

 Converts absId --> (sm, eta, phi) for a cell.
 Works both for EMCAL and for PHOS.
 Geometry must be already initialized.

 getters