Hello, I've been using 'super' to align the c-alphas within one domain of two different models of the same protein while leaving the second domain to move freely. I can do this using: super (A and resid 1-100 and name ca), (B and resid 1-100 and name ca) What I would like to do is determine the rotation and translation of model B's second domain as it moves away from A's second domain. I can output a matrix after running super using: print cmd.get_object_matrix("A") How do I go from the matrix to an angle and distance? Thanks for any thoughts, Jon