Hi Han, I have now merged your xyz branch into the main 1.3 line. There was only one conflict in this process, and it was easy enough to fix. I have now run the test suite, and noticed that the test_read_xyz_internal2 system test fails. This can be quickly checked with: $ ./relax -s Structure.test_read_xyz_internal2 I think I remember seeing this problem before, but I thought that it was solved in the xyz branch. Could you check the 1.3 line and see if all your code is in there? Or check what could be the source of this problem? I would like to release a new version of relax soon with this code (along with a series of bug fixes) prior to releasing a new version with Gary Thompson's multiprocessor code, and then a version with the new GUI code (hopefully all by the end of next week). Cheers, Edward