For the data set http://www.cave-registry.org.uk/svn/CheddarCatchment/LongwoodValleySink/ Therion 6.3.3 on Debian Hmm I see the latest I can is 6.3.4 The log as appears in the bottom pane on Xtherion compile screen has this 1> Survex 1.4.14 2> Copyright © 1990-2024 Olly Betts 3> 4> Survey contains 2204 survey stations, joined by 2225 legs. 5> There are 22 loops. 6> Total length of survey legs = 1004.00m (1003.23m adjusted) 7> Total plan length of survey legs = 791.23m 8> Total vertical length of survey legs = 439.09m 9> Vertical range = 126.27m (from 1305 at 207.00m to 1039 at 80.73m) 10> North-South range = 120.50m (from 800 at 55516.87m to 1039 at 55396.36m) 11> East-West range = 117.84m (from 2027 at 48588.80m to 1625 at 48470.96m) Where has the survey info on the right has this name: LongwoodValleySink title: LongwoodValleySink length: 1030.92m (surface 0.00m, duplicated 109.15m) vertical range: 126.27m (from 0@LongwoodValleySink at 207.00m to 32@CrystalPitch.LongwoodValleySink at 80.73m) 1030.92 to 1004.00 Andrew