This class handles a list of GTI extensions. In particular
it handles merging GTIs by "or-ing" them.
Return the EXTNAME for the file which has been (or would be) returned
by the merge method. This is either the defualt extension name or
the name of the extension in the existing file if thewre is only one file.
If you give an argument, then the default extension name will be set to that.
- merge(default, merged_file, operation, target, operation, newfile, operation)
Merge the GTIs by "or-ing" them with the mgtime FTOOL.
If there is only one file, it returns that file.
- merge_and_append_to(target, operation)
Merge the GTIs and then append the result to a given FITS file.
- merge_or_extract(newfile, operation)
Merge the GTIs, forcing a new file to always be created - unlike the
merge method which will just return the original file if there is only
one file in the list.
The EXTNAME of the merged/extracted file will always be the default.