Computation of Electron Density Maps of a helical
structure
The fiber_refinmapstatement can be used to calculate
electron density maps, which can be calculated by a
BesselFourier transform of :

(15.10) 
To reduce the computational time, a factorization method which is
similar to the BeeversLipson factorization method is applied to
the BesselFourier transform. The first step is an
onedimensional Bessel transform:

(15.11) 
Because the electron density map is usually rendered in the
orthogonal space, coefficient is
converted from the cylindrical space into the orthogonal space
in the Fourier transform:
The Fourier transform of in the final
step yields the electron density map:

(15.13) 
Subsections
XplorNIH 20231110