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Much of the information required and generated by LEXT is tabular in nature. This may be information about objects, spectral lines, mask parameters etc. The generic name for these tables is the list. Since they can contain different things, lists are distinguished by their . The is held within the list data structure along with a descriptive , the details of the number of columns and entries in the list, and, where appropriate, the column headers.
Some functions which can be performed on lists are specific. In many cases there should be one LIST of a particular corresponding to the particular observation being reduced. In these instances routines which require a particular such LIST will search the stack for it, and will report an error if they don't find precisely one. An attempt to produce more than one list of certain (eg. MASK) will also result in an error for this reason.
LISTs which are created as output by LEXT commands, are usually given their , and also their , automatically.
The complete set of standard list is given in appendix B.