There is
two alignment type in Spharm-Pdm.

- The first type performs
an alignment of the normalized first
order ellipsoid axis to the unit-axis with the ellipsoid center located at the origin. 

- The second alignment
type is a rigid-body Procrustes alignment, i.e. Procrustes alignment only with translation and rotation. 

Whereas the first alignment is object inherent, the Procrustes alignment
is in need of a template, which can optionally be supplied.

What is the main difference between the two types ? Which one must I use
for analyses ?

Best Regards…