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Tables are ensembles of columns strictly equivalent to the formatted files.
The only difference is that they are unformatted, and hence access time is
typically 50 times faster... The number of lines is fixed, but the number
of columns may be extended indefinitely. In fact, a table may be consider
as a 2-D image (and vice-versa if you want) but does not require ``axis''
information... Tables can be accessed in command COLUMN using option
/TABLE instead of /FILE. Using tables is
recommended whenever a large number of rows or columns. Two programs can be
used to convert from tables to formatted files (GILDAS_RUN:LIST.EXE)
and vice versa (GILDAS_RUN:TABLE.EXE).