the orientation sets were downloaded from:
charles.karney.info/orientation/

for more in-depth information see:
Charles F.F. Karney
Quaternions in molecular modeling
J.Mol.Graph.Mod. 25(5), 595-604 (Jan. 2007)
Preprint: arXiv:physics/0506177

format is:
Any number of initial comment lines beginning with #
A line containing 'format quaternion'
A line containing N alpha(degree) c
N lines containing q0i q1i q2i q3i wi

wi are the relative weights, which is important for average orientations
but it has no value here.
