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Method
Each of the user-supplied list of datasets is checked against the
first to see that its structure is similar. The output dataset is
formed using the total lengths of the lists found in the input
datasets.
Datasets with different pointing directions can be merged - the
output file will have the orientation of the first image. Only the
X_CORR and Y_CORR lists are affected (if present).
Most header components (and the instrument response) are copied
from the first input dataset. The exceptions are:
- BASE_MJD,BASE_UTC,BASE_DATE,BASE_TAI :
- These 4 header parameters, and all other timing information in
the input datasets are adjusted to the origin defined by the
dataset with the earliest BASE_TAI.
- EXPOSURE_TIME, OBS_LENGTH :
- Are calculated from the sums of the values in the input datasets.
Only written to output if present in all inputs.
- LIVE_TIME:
- Live time slots from the inputs are merged and sorted into time
order. Any duplicate slots are removed.
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