prodsingle scripts have hardcoded T0 arrays

[wforeman]

Prodsingle scripts should always inherit T0, since this value is subject to change with future TPC readout and cosmic sim adjustments. Multi-particle guns currently list out the array explicitly (T0: [blah, blah..]). Is it possible to slot in a fcl parameter via @local or @sequence or @table?

[marcodeltutto]

Hi Will, I can take a look at this.

I see that the T0 should be set to zero with the current configuration. I think we should define a “singles_T0” fhicl param, and then use this in every particle-gun generation. I don’t see a way to have a variable-size variable in fhicl that could work for an arbitrary number of particles - so we would have [@local::singles_T0, @local::singles_T0] for two particles, and so on. I think this is fine, the important thing is that we don’t have to type the t0 value by hand.