The Q form and S form of a canonical volume should be the same. It is not important for it to be exact, but it has to be basically correct, so you can initialize alignments.
For volumes recorded on our magnet, a serviceable Q = S form is:
0.9994 -0.0349 0.0000 -81.5687
0.0349 0.9994 0.0000 -131.4221
-0.0000 -0.0000 1.0000 -132.7831
0 0 0 1.0000
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