Extends the SimplePeaks records with the following attributes (p must be given at construction time!):

v

diffracted out-ray

c

diffraction vector at goniometer Zero

chi

The height of the peak above the equator (requires rotaxis in the constructor)

theta

the diffraction angle theta corresponding to the peak

r

the radius of a circle around the primary beam on the detector (in mm) that intersects this reflection.

a

the angular position of the peak on the same circle.

addpeak (
        self,
        *arg,
        *kw,
        )