The following option is relevant only to raw graph, i.e., is
relevant only if no display type or output format is specified with the
`-T' option. In this case graph outputs a graphics
metafile, which may be translated to other formats by invoking
plot. This option should appear on the command line before any
file names, since it affects the output of the plot (or multiplot) as a
whole.
`-O'
`--portable-output'
Output the portable (human-readable) version of GNU metafile format,
rather than a binary version (the default). This can also be requested
by setting the environment variable META_PORTABLE to "yes".
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