The problem is in the arrows ... \startMPinclusions def set_ahlength (text t) = % ahlength := (ahfactor*pen_size(_op_ t)) ; % _op_ added % problem: _op_ can contain color so a no-go, we could apply the transform % but i need to figure out the best way (fakepicture and take components). ahlength := (ahfactor*pen_size(t)) ; enddef ; \stopMPinclusions Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------