[Rivet] Question about FastSim in Rivet?

[Eric Conte]

Dear Rivet authors,

For a review, I am interesting in learning more about the detector 
simulation (efficiency/smearing) available since 2.5 for BSM. Could you 
point me out the related sources files ? Is there any link with detector 
simulation of the Gambit project?

Thank you very much for your help,
Cheers,
Eric