.m2p file format

GROMACS version: 2024.2
GROMACS modification: Yes/No
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Hello, everyone!
I have done a 2d rmsd analyses of a MD trajectory and now I have a matrix (.xpm) that I should use with xpm2ps to visualize the results. I didn’t understand what the documentation says about the flag -size o single matrix sizes:

“When no .m2p file is supplied, many settings are taken from command line options. The most important option is -size, which sets the size of the whole matrix in postscript units. This option can be overridden with the -bx and -by options (and the corresponding parameters in the .m2p file), which set the size of a single matrix element.”

I am questioning this because the image I got the x and y axis dos not contain contain the correct spacing of the MD steps. it goes from 0 to 1000 ns, but it ends in half the graphic. The image is attached.

If anyone could help with this, I would be very grateful.

This looks like a bug. Strange that no one ran into this before. The format is describe here:
https://manual.gromacs.org/current/reference-manual/file-formats.html#m2p