The module PacsEng_SPEC_orbit_prologue is the expertHSPOT equivalent of IST's module SPEC_setup_OBS (see Wiki page http://wiki.mpe.mpg.de/Herschel/PACS/FM_ILT_Procedures/SpecOperations#head-83e323b638cc55f573fba14243a103ca9a8ef4d8)