If flux calibration is to be done then the calibration frame must be presented in a Starlink sdf in the same form as the data frame.
ECHOMOP presently insists that all frames are of the same X- and Y-dimensions (a pretty safe bet). Care should be taken to ensure the correct extraction of the calibration frame. For example, a different CCD bias voltage may have been used to that which used for the object data frame, etc.
Flux calibration is not usually performed on the very-high-resolution spectra produced by UCLES. This is due in the main to the lack of suitable reference tables. As more UCLES data become available this situation should improve.
Martin Clayton