Currently there is not.
I would like to have that feature as well.
can't you simply set all z-coordinates to zero and carry out a 3D fit as usual?
(you may get a problem with mirror images, but the handedness is anyway not
anymore uniquely defined once you project on 2D).
I don't think so. If you set z=0 then you may have numerical problems
with the Jacobi subroutine.
Phuong
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