- O/IR System
Data from Gemini facility instruments is in Multi-Extension FITS (MEF) format. MEF files consist of a Primary Header Unit (PHU) and one or more extensions that contain pixel data. The PHU is indexed 0, the first extension is indexed 1, etc. Standard IRAF is designed to work with FITS files that contain header and pixel data in a single file. Gemini IRAF was written to work with MEF files. Additional details can be found on the Gemini website under data-formats.
Last updated or reviewed January 18, 2017.