Per @mewall update cctbx_project so the diffuse anisotropy matches that given in the Wall paper. Manuscript states: In this case, streaked diffuse features were produced by multiplying γ by an anisotropy factor along the a–b and c unit cell directions in direct space (leaving a+b alone), and multiplying σ^2 by the same anisotropy factor along the a–b direction (leaving a+b and c alone). The Laue symmetry was then applied, leading to streaks along both the a*–b* and a*+b* directions in reciprocal space.
Per @mewall update cctbx_project so the diffuse anisotropy matches that given in the Wall paper. Manuscript states: In this case, streaked diffuse features were produced by multiplying γ by an anisotropy factor along the a–b and c unit cell directions in direct space (leaving a+b alone), and multiplying σ^2 by the same anisotropy factor along the a–b direction (leaving a+b and c alone). The Laue symmetry was then applied, leading to streaks along both the a*–b* and a*+b* directions in reciprocal space.