How to add one eps page into a ps file?

In a macro, I create a multi-page ps file by using:

and in the mean time, I have another eps file (index.eps). I would put the eps file to the 1st page of the multi-page ps file. How can I do that in a ROOT macro. I have tried to use

but the file doesn’t show my figures correctly.

try to use psmerge (many reference on the web. Here is one