[Therion] Problem with diving data

Hi all, I am currently trying to draw a map with diving data. But she I compile, I receive a metapost error. This probably because of the structure of my data, but even after reading The THbook and the Survex tutorial, I do not understand where/why. Can someone give me any advise ? I attach to this emai a zip file that contain : - a simple part of my diving data, with its thconfig file - The associated log file. Thanks a lot ! Xav -- Xavier Robert Chercheur/Researcher CR2 - IRD ISTerre - Maison des Géosciences 1381 rue de la Piscine - BP 53 38041 Grenoble Cedex 09 France Phone : Fax : 33 (0)4 76 51 40 58 xavier.robert01@gmail.com