c4d_[0-9]{6}_[0-9]{6}_oow_[grizY]_v1\.I\.fits\.fz
, where the numeric label corresponds to a rough exposure date-time, "oow" indicates this is a weights file, the band observed is indicated (grizY), a version number for the NOIRLab community pipeline which performs image preprocessing is appended, and the "I" indicates that a synthetic injection has occured. This naming convention follows the convention set by NOIRLab.
Exposure level header containing meta information about the telescope, pointing, etc. For more details, see the NOIRLab (formerly NOAO) documentation. Identical to oow file header.
Weights from the injected version of the CCD specified by the HDU name. Header contains CCD level information from the telescope. Identical to oow file header.
An example oow file is linked here: c4d_190503_101947_oow_Y_v1.I.fits.fz