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Next time, I would do it that way as you suggested or use other ways like create a tex file with gnuplot. But the fundamental question remains, why the ps2pdf conversion creates a pdf with the document properties changed (i.e. inherit the properties of the last gnuplot-created .eps image in the file ...

Well, it is possible to use pdflatex on .eps, but then psfrag won't work.

Hello,

Including a figure in EPS format generated by Gnuplot and creating a PDF using LaTeX -> DVI -> PS -> PDF, the document properties (title, subject, creator etc.) of the generated PDF are taken from the last EPS figure included.

If I try another figure in EPS format not created by Gnuplot ...