hi, pytraj has been failing for awhile due to the change in pdb format. In below line, the 'Z' column is new. Is it expected? `ATOM 1 N SER Z 1 -1.889 9.159 7.569 1.00 0.00 N` Here is the the assertion in pytraj: https://github.com/Amber-MD/pytraj/blob/7ee64bd01060606b55b6ec464f3ab2f0e418df2b/tests/test_io/test_io.py#L336 Here is the input commands: ``` parm tz2.parm7 trajin tz2.nc 1 1 trajout test.pdb ``` cheers