The filename format for the PACS HPDPs are

[field]_[band].fits

Band can be "blue" (70 microns), "green" (100 microns), or "red" (160 microns).

Single-extension fits files have an additional suffix, "_img" for science
images, "_err" for uncertainty images, and "_cov" for coverage images. The 
multi-extension fits files have no suffix and contain all three images in 
different extensions.

Return to IRSA PHPDP overview page: https://irsa.ipac.caltech.edu/data/Herschel/PHPDP/overview.html