Double check secondary corrections for 8 GeV in ECAL digi

[tvami]

Is your feature request related to a problem? Please describe.

I was just talking with Tom regarding these numbers
https://github.com/LDMX-Software/ldmx-sw/blob/trunk/Ecal/python/digi.py#L207
seem to be specific for 4 GeV.

Describe the solution you'd like

Just check if the numbers are very different for 8 GeV or not.
I understand from Tom that the way these were calculated is simply to shoot an 8 GeV electron gun into the ECAL (from (0,0,240) with zero angle) and fit a double-sided Gaussian

Describe alternatives you've considered

It's second order effect, probably not too high of a priority

[tvami]

@anandaguha can you please look into this? You are running guns anyway

[anandaguha]

I am just not 100% sure about what distribution I will be fitting the double sided Gaussian to, but everything else seems pretty simple for me to do.

[tvami]

sure about what distribution I will be fitting

that ok, let's chat about it!