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troff features that fit poorly elsewhere.
Retrieve the bounding box of the PostScript image found in file,
which must conform to Adobe’s Document Structuring Conventions
(DSC), locate a %%BoundingBox comment, and store the (upper-,
lower-, -left, -right) values into the registers llx,
lly, urx, and ury. If an error occurs (for
example, if no %%BoundingBox comment is present), the formatter
sets these registers to 0.
Control the search path for file with the -I command-line option.