On Mar 3, 2011, at 6:17 PM, Per Ting wrote: > Thanks, tried this one, did not work either. > > Per > > > The parametric functions are not understood. Yo need too rewrite then as > > 3*cos(t)^3 | 5*sin(t)^5 > What error message are you getting from ps2pdf? It works for me using TeXLive 2010 with all updates up to a few days ago. Michael