The detector type should be specified, so that programs using the data can have approximate information about the spectral response and other characteristics of the detector. The primary indicator is a character column, DET, which contains 'PMT' if the detector is a photomultiplier; 'SILICON' for Si-CCDs and Si photodiodes; or 'OTHER' for any other type. (As detector technology evolves, one would expect to extend this list.)