Dear ConTeXt folks, looking for graphics example and therefore searching the list I found the answer from David Arnold in the ntg-context list thread »OT: looking for metapost/fun examples« [1]. It is for plain MetaPost and works fine with `mpost` after making sure to remove the line breaks inserted by the mail program. I then copied it into `\{start,stop}useMPgraphic`, removed the `end ;` and `{begin,end}fig` and replaced `{e,b}tex` by `textext()` but still get the following error. ! terminal: ! Redundant equation. <to be read again> ; <*> ...500; dt:=(tstop-tstart)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in; q=(a,c)-... ! Redundant equation. <to be read again> ; <*> ...start)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in; q=(a,c)--(b,c)--(b,d)--(a... . system > tex > error on line 39 in file arnold-2005.tex: terminal: ! Redundant equation. <to be read again> ; <*> ...500; dt:=(tstop-tstart)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in; q=(a,c)-... ! Redundant equation. <to be read again> ; <*> ...start)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in; q=(a,c)--(b,c)--(b,d)--(a... Does someone have an idea why this fails and how to fix it? Thanks, Paul [1] http://www.ntg.nl/pipermail/ntg-context/2005/009928.html