Yes, LSQKAB does, but not the equivalent screw axis (which exists by Chasles theorem). I think a screw
axis may well be the best way to describe the rigid body movement which began the thread. A simple
distance and angle (2 numbers) are easier to understand, and often of more biological relevance, than
RT matrices, for example in the case of relative domain motions.

On Jun 20, 2012, at 5:20 PM, Mark J van Raaij wrote:

LSQKAB ("superpose" in CCP4i GUI) also outputs in its log-file the translation parameters and rotation matrix it used to superpose the structure.