update to v20f_mcbm

setup/setup_mcbm_beam_2020_03.C

@@ -59,7 +59,8 @@ void setup_mcbm_beam_2020_03()
   TString muchGeoTag      = "v20a_mcbm";    // 2 layers
   TString trdGeoTag       = "v20a_mcbm";    // 2020 // 1 TRD module
 //  TString trdGeoTag       = "v18q_mcbm";    // 2018 // 2 TRD modules 
-  TString tofGeoTag       = "v20b_mcbm";    // corrected z position
+//  TString tofGeoTag       = "v20a_mcbm";    // corrected z position
+  TString tofGeoTag       = "v20f_mcbm";    // corrected z position
   TString richGeoTag      = "v20d_mcbm";    // geometry provided by RICH group
   TString psdGeoTag       = "v18d_mcbm";    // at 25 degree, below the beampipe
   // ------------------------------------------------------------------------