void simfast_opt(TString Prefix, TString Decfile, Float_t Mom, Int_t nEvents = 1000, TString Resonance="pbarpSystem0", int Pdgcode = 11, 
           TString DetOpt="MvdGem EmcBar Drc Dsc FwdSpec" )

DetOpt    : Parameter string to control detector setup for scrutiny process with some predefined options. For other configurations better use simfast.C 
            Appearance of each parameter is a *positive* switch! Default value "MvdGem EmcBar Drc Dsc FwdSpec" represents complete detector. 
            Detectors always being enabled are: EmcFwd, EmcBw, STT, Barrel MUO   
            FwdSpec = EMC FS, Fwd MUO, Fwd tracking, RICH

             - MvdGem    : Enable MVD and GEM for central tracking in addition to STT
             - EmcBarrel : Enable EMC barrel for calorimetry (neutral detection and PID component)
             - Drc       : Enable Barrel DIRC for PID
             - Dsc       : Enable Disc DIRC for PID
             - FwdSpec   : Enable complete Forward Spectrometer (= Fwd Spec. EMC, Fwd Tracking, RICH, Fwd MUO)