The file names used by DIGIT are explained in detail in Section 6 
of the Delivery Document, particularly in Fig. 9.
https://irsa.ipac.caltech.edu/data/Herschel/DIGIT/docs/DIGIT-FOOSH-COPS_release_note.pdf

Return to the overview page:
https://irsa.ipac.caltech.edu/data/Herschel/DIGIT/overview.html