[ALUG] How to print one image on multiple pages?

I used to be able to do this by mistake! Now I can't work out how to do it on purpose. I want to print a .PDF diagram on two sheets of A3 rather than a single sheet, it's too small on a single sheet. How can I do this? I can't see any options in gv or, more to the point, in the CUPS printer set up, that allow me to tell the printer interface to do this. -- Chris Green (chris@halon.org.uk)