* Discussion on effective volume / effective area computations

- Summary of the current status

• GENHEN: generation of vertexes in a volume, straightforward computation of the effective volume. gSeaGen: generates starting point over a surface -> the natural figure of merit is an effective area
• Generalise the computations of both Effective Volumes and Areas. Git Issue: https://git.km3net.de/working_groups/simulations/-/issues/55

- What is needed in the files?

• Generation volume in the events would make things easy:
  • Generation Area x Interaction Length. This Interaction Length is however dependent on the neutrino cross section
  • Cylinder can be both in water and rock. How is this treated? Effective mass?
  • To be put in the w2list
  • Document effective mass/volume. also per decay mode
    • (using parent/daughter relations - information must be available. e.g tau-to-muon, tau-to-electron, tau-to-hadrons).

- Differences between generators

• km3buu will work inside gSeaGen, so generation volumes will be inherited
• GENHEN no developments foresee unless interest arises.