class AliStarEvent: public TObject

ctor

ctor

copy ctor

assignment

set params

dtor

get track i

add a new track to collection

remove all tracks if any and zero the event information

print info
 TNtuple* event: names are documented in the next 2 lines
 event  = new TNtuple("event","event",
   "runId:eventNumber:VtxX:VtxY:VtxZ:BField:refMult:centralityId:numberOfPrimaryTracks:numberOfParticles:h0:h1:h2:h3:h4" ) ;

 Note Carefully:  Centrality is based on refMult.  This is the 'reference' multiplicity that is measured
 independpently from the TPC.  Selecting the centrality bins according to the refMult is something that
 is calibrated for each year and each run.  You can get the basic information off the web:
 For Example .... http://www.star.bnl.gov/protected/common/common2004/trigger2004/200gev/200gevFaq.html
 An index pointing to FAQs, Trigger and Centrality data, for all years, is available at:
 http://www.star.bnl.gov/public/all

 Note: Add 0.5 to the (int) that is returned by centrality() when using it as an argument for a histogram
 that expects (float) or (double) as input parameters.  This will place the data point in the center of
 the bin, avoids ambiguities, and is best for plotting scatter plots and contour plots.
 For example histogram2D[1] -> Fill ( (float)CentralityID + 0.5 , SumData )   ;

 The refMult quoted in the Centrality bins array is the lower limit on refMult