gmt-fork/doc/rst/source/explain_-s_full.rst_

.. _-s_full:

**-s**\ [*cols*][**+a**\|\ **r**]
    Suppress output for records whose *z*-value equals NaN [Default
    outputs all records]. Append **+a** to skip records where at least
    one field equal NaN, or append **+r** to reverse the suppression, i.e.,
    only output the records whose *z*-value equals NaN. Alternatively,
    indicate a comma-separated list of all columns or column ranges to
    consider for this NaN test (Column ranges must be given
    in the format *start*\ [:*inc*]:*stop*, where *inc* defaults to 1 if
    not specified).