By default the selection is taken from the ins file. With a rough starting model this value should be 1.0. The resulting indices all are less or equal to n . See tilt . The opposite operation is called reduce .
Lower values give more accurate results.
In contrast to the volume refinement, the ratio of the distances is allowed to change. For each axis, the crystal is rotated from phistart to phistop with delphi steps. A new orientation is ignored if it is within angmin degrees of an already generated one. The crystal shape is held constant during the refinement. Please be aware that the indices of the faces may become relatively high numbers, which you may want to reduce .