Rotations require a definition of the "center of model" for each active model. By default, this is the center of the model's bounding box (the smallest box that completely encloses the displayed parts of the model). When more than one model is active, the combined bounding box determines the center of rotation (see cofr). Setcom is used to change the locations of centers of individual models when those computed automatically are unacceptable.
Model_number should not be preceded by #. The new center of the model in model_number is placed at coordinates x_coord, y_coord, and z_coord. If radius is given, it should be the shortest radius (in angstroms) from the new center that encloses the model. This helps in framing the models in the graphics window.
~Setcom will cause reversion to the automatically computed center(s).