( is called by: hec_ini.f )
Includes the following commons:
hec_par.inc
hec_datacard.inc
hec_geo.inc
There is a different geometry file for every testbeam run period.
The runperiod is specified in the datacard file.
hec_geo calls subroutines hec_geo_xxx.f, where xxx is the month and year
of the run period.