document a few settings

diff --git a/PWG2/FLOW/Tools/glauberMC/runGlauberMCexample.C b/PWG2/FLOW/Tools/glauberMC/runGlauberMCexample.C
index 5e67a0d205869c94fa519fc2b7cc35905757e010..977573b3b83f08d119cb9117c2b17b69c93bbf3f 100644 (file)
--- a/PWG2/FLOW/Tools/glauberMC/runGlauberMCexample.C
+++ b/PWG2/FLOW/Tools/glauberMC/runGlauberMCexample.C
@@ -2,7 +2,16 @@
   //load libraries
   gROOT->Macro("initGlauberMC.C");
 
-  //run the example code:
-  //AliGlauberMC::runAndSaveNucleons(10000,"Pb","Pb",72);
-  AliGlauberMC::runAndSaveNtuple(10000,"Pb","Pb",72);
+  Int_t nevents = 10000; // number of events to simulate 
+  // supported systems are e.g. "p", "d", "Si", "Au", "Pb", "U" 
+  Option_t *sysA="Pb"; 
+  Option_t *sysB="Pb";
+  Double_t signn=72; // inelastic nucleon nucleon cross section
+  const char *fname="GlauberMC_PbPb_ntuple.root"; // name output file
+
+  // run the code to produce an ntuple:
+  //  AliGlauberMC::runAndSaveNucleons(10000,"Pb","Pb",72);
+  Double_t mind=0.4;
+  AliGlauberMC::runAndSaveNtuple(nevents,sysA,sysB,signn,mind,fname);
+
 }