(y,z)_f & (x,z)_s -> fileNumbers -> create chain of those files
compare all events in the two chains * first load only PSD coordinates & calculate trajectories distance & "crossing point" * if distance(crossing point, (x,y,z)) < eps : load traces & calculate chi2 * keep list of N best chi2 * calculate average pulse shape & save in tree
misc
calibrations (before: set correct SIS settings, pretrigger delay is wrong!)