The input data frames are expected to be in Starlink sdf files. The data themselves being stored in a 2-dimensional array accessible via the path
- /filename/.NDF.DATA_ARRAY
In fact, ECHOMOP is more flexible than many Starlink programs and can accept any object in an sdf as a data frame array. Thus an sdf could contain multiple frames for a single observing run:
- filename/.QSO.NDF.DATA_ARRAY
- filename/.QSO2.NDF.DATA_ARRAY
- filename/.GALAXY.NDF.DATA_ARRAY
- filename/.FLAT.DATA
This capability may be useful when a foreign data format has been translated into an sdf, but with non-standard object names.
Martin Clayton