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</head><body><p>Hi List<br></p><p>I'm using this data lines for survey:<br>data normal from to left right up down tape compass backcompass clino backclino<br></p><p>In general all data is available, but in some point I have some missing data like LRUD, Compass/Backcompass or Clino/Backclino.<br>When I have missing LRUD data or missing backcompass I put in a minus "-" and this is OK.<br>But when I use "-" for backclino I get an compilation error:<br></p><p>reading source files ... <br>C:\Program Files (x86)\Therion\therion.exe: error -- ....filename.... -- invalid backwards gradient reading -- -<br>writing xtherion file ... done<br></p><p>Is this a bug? Because for LRUD and Backcompass minus sign is working fine.<br>What sign can I use for missing backclino readings?<br></p><p>regards,<br>Torsten<br></p></body></html>