Merge branch 'Improve_tile_sfC' into '21.0'

Add fit function results to output root file of tile_sf.C

See merge request atlas/athena!30354

TileCalorimeter/TileExample/TileSimEx/share/tile_sf.C

@@ -93,6 +93,7 @@ void Make_plots(TString infile_hit, TString infile_truth, TString outfile, bool
     
     if (dofit) {
         hp_totalEvsZ->Fit("thefun","","",-15.,15.);
+        HistArray.Add(thefun);
     }
     
     cout << "file name " << infile_hit << endl;