# Follow-Up Items
# Derek Anderson
# 11.05.2024

Here are some links to the various GDML files used in our simulation:
  - All of the STEP and FCstd files are stored in the `epic-data` repository at:
      https://github.com/eic/epic-data/tree/main/barrel_HCAL_gdml
  - John wrote a very nice, descriptive readme for the directory that details what's in each file,
    what it was generated from, and if there were any changes made.
  - Then, they actually get used in the `DD4hep` simulation at:
      https://github.com/eic/epic/blob/main/compact/hcal/barrel_gdml.xml
      https://github.com/eic/epic/blob/main/src/BarrelHCalCalorimeter_geo.cpp

Clustering thresholds:
  - Last changed on August 31st, 2023 in EICrecon#883:
        https://github.com/eic/EICrecon/pull/883
    - I bumped the threshold for clustering tiles from 3 MeV to 5 MeV based on discussion in
        https://docs.google.com/spreadsheets/d/1s8oXj36SqIh7TJeHFH89gQ_ayU1_SVEpWQNkx6sETKs/edit?pli=1&gid=238482234#gid=238482234
        https://indico.bnl.gov/event/20245/#5-barrel-hcal-dynamic-range-es
  - The 3 MeV threshold was a placeholder from the pre-ePIC days, and was actually being
    used while we were doing tower clustering. See the discussions here:
        https://indico.bnl.gov/event/18223/#1-barrel-hcal-clustering
        https://indico.bnl.gov/event/17709/#4-barrel-hcal-update

  - The change to tiles 1st happened (we've updated the readout structure twice since then) on
    April 12th, 2023 in EICrecon#598:
        https://github.com/eic/EICrecon/pull/598
    - The thresholds were NOT updated in this PR, so we were actually using the 3 MeV threshold 
      while doing tower clustering

  - nb. the threshold for digitization was updated last on November 6th, 2023 in EICrecon#1095:
        https://github.com/eic/EICrecon/pull/1095
    - Kolja swapped out the energy threshold for the ADC threshold based on discussion in
        https://brookhavenlab.sharepoint.com/:x:/s/EICPublicSharingDocs/EeICxMJ9vGtPtyq5g4qzcSwBKCqkHDj06KDdSvYQ7pxqrQ?rtime=nVc82LX93Eg
    - And the digitizaiton were 1st updated from their pre-ePIC placeholder values on March 24th
      2023 in EICrecon#557:
        https://github.com/eic/EICrecon/pull/557