pdfcrop x x is executed on a PDF plot file, and
convert x -trim x is executed for other types of plot files, where
x is the plot filename.
the plot filename
whether to suppress standard output from the command line utility
pdfcrop is often shipped with a LaTeX distribution, and
convert is a command in ImageMagick (Windows users may have to put
the bin path of ImageMagick into the PATH variable).
The original filename.
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