This option creates margins around the graph for company logos, annotated notes,
and so on. You can also specify the unit of measurement. The default unit is pixels.
For a list of measurement units that are supported, see “Units of Measurement” on
page 914.
Use pad options to create non-uniform padding. Edges that are not assigned padding
are padded with the default amount.
pad-options can be one or more of the following:
LEFT= dimension<units>
specifies the amount of extra space to add to the left edge.
RIGHT= dimension<units>
specifies the amount of extra space to add to the right edge.
TOP= dimension<units>
specifies the amount of extra space to ...
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