I have a large graph of archaeological sites (medieval mines) connected by multiple surface surveys. The ensemble counts more than 120 sites ("entrances") with 28km of survey including about 5000 stations connected by 500 legs with 187 loops and 297 connected components. Of course the surveys were done by different teams with different accuracies and the fixed points are GPS points with very different accuracy (from more than 30m to 1m for the professional GPS points by a geometer). I have heavily used the sd command to correctly weight the different measures in the least-squares loop correction estimation, which means that internally the system should have a pretty good idea of the accuracy of each station location. What I would like is to extract the standard deviation of the entrance locations when I export the coordinates in the cave-list export. Does anybody has an idea of how to extract this standard deviation information? Xavier --

------------------------- Xavier Pennec Senior Research Scientist / Directeur de recherche Asclepios project-team, INRIA Sophia-Antipolis 2004 Route des Lucioles, BP93 F-06902 Sophia-Antipolis Cedex, France +33 4 92 38 76 64 +33 6 78 35 16 90 http://www-sop.inria.fr/asclepios/ -------------------------------