Full-enclosure IRFsΒΆ
Full-enclosure IRF format has been used for calibration data and IRF of X-ray instruments, as well as for the IRFs that are distributed with the Fermi-LAT science tools.
Any full-enclosure IRF component should contain the header keyword:
HDUCLAS3 = FULL-ENCLOSURE
From here on, the specific format of each IRF component: