Survex will generate a list of XYZ co-ordinates from a 3d file, so you "could" generate a 3d file from Therion and then run it back through Survex using the "convert for hand plotting option". For historical reasons, amongst others much of our data is in Survex format and is imported into Therion as 3d files. The Survex viewer, Aven, does have some capabilities that Lox does not, such as a simple method of measuring the distance between points and a direct read off of co-ordinates. Latest versions also have useful features such as "colour by date" and "colour by error" which I would like to see in Lox. One current problem is that 3d files generated with the most recent development snapshots of Survex, to version 1.1.15 are not recognised by Therion 5.3.4. Does this happen with 5.3.5? Graham