Fit a TMultiGraph by loading a .root file into a script

ROOT
2

To get the individuals graphs from a TMultiGraph you should do a loop similar to:

   TList* grlist;
   grlist = mg->GetListOfGraphs();
   printf("This multi-graph contains %d graphs\n",grlist->GetSize());
   TIter next(grlist);
   TObject *obj;
   TGraph *gr;
  
   while ((obj = next())) {
  	gr=(TGraph*)obj;
...
   }