Hello, I think I have faced a bug during the conversion of RDC restraints into ARIA/CNS format. I have got the output which looks like: ASSIGN (resid 999 and name OO ) (resid 999 and name Z ) (resid 999 and name X ) (resid 999 and name Y ) (segid " A" and resid 3 and name N ) (segid " A" and resid 3 and name HN ) 10.5000 0.5000 1.0000 Providing Aria with this file leads to the errors and finally Aria stops. I dug out in *.out files that the third value (1.0000 above) is not recognized. If I manually correct the .tbl file then Aria runs smoothly. Indeed, in the Aria manual the RDC .tbl format has only two values: rdc and error. This is a link: http://www.pasteur.fr/recherche/unites/Binfs/aria/aria1.2/html/manual/manual/node22.html I have "CCPNMR Analysis Version 1.0. Release 15" installed with all updates. Seems the bug slipped through somehow. Thank you, Vitaliy