problems with print command

Hi,

I'm making a eps file from a Matlab figure by means of the print command. The problem is that a very thin lines (three) appears throughout the figure in the output file.

I've tried all the options given in the print command but I'm always getting the same problem.

I don't know if that problem can be related to my old version of Matlab (6p1). Can anyone help me?

Thanks in advance for your attention. Jesús