How to remove clipping mask lines in color data

Hi,

I am trying to plot color data that I exported from Matlab as .eps. I had good results with this in the past but this time some of the clipping mask lines that came with the .eps export file show through the data on some zooming levels. I am talking about the faint lines that are circled in blue, not the thick, clear horizontal black lines (they are not the issue). I tried exporting as PNG and BMP to see if the lines disappear but they don't. When I zoom 300% the lines disappear.

Is there a way to remove these lines?

Thank you.