Just been doing the final checks on my survey, and found a thin line that should not be there in the colour file see http://wotcc.org.uk/__Therion/ThinLineInFile.png generated by http://wotcc.org.uk/__Therion/ThinLineinFileth2.png A bit of investigation shows that the lower right station (1) of the line is surface and the upper left is not surface (station 1.1) not sure if this is actually related as I needed a quick fix so. Deleting them solves the problem, but that is not really a good solution see http://wotcc.org.uk/__Therion/NoLine.png and http://wotcc.org.uk/__Therion/NoLineth2.png Therion 5.4.3 on Debian Raw data is at http://www.cave-registry.org.uk/svn/CheddarCatchment/Bagpit/Bagpit/ version 409 has the line it is fixed in version 410 (sorry the head is only available on line, but the full data set is downloadable using an svn client) thanks Andrew