xpick and dvips
Some old PostScript spoolers or post-processing programs
get confused by comment statements
inside Encapsulated PostScript files.
Therefore the dvips program, by default,
eliminates PostScript comment lines in EPS files,
i.e. those starting
% in column 1, from the generated output file.
As xpick uses the PostScript level 2 compression algorithm
and the latter sometimes
generates lines starting with that character, you
must use dvips with the option
dvips -oout.ps -K0 infile.dvi