I notice in the Therion source metapost there is an 'area dimensions'. It seems to be a clone of 'area bedrock', but perhaps there is a more cunning purpose? What is it for and how is it used? Bruce -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20121113/b3312b42/attachment.htm>