How to export two-dimensional Coulomb potential V(e,e')

[nintendo-64]

Dear developers,

In this letter https://journals.aps.org/prb/abstract/10.1103/PhysRevB.106.L180501, the authors ploted a two-dimensional figure of Coulomb potential V(e,e') which can describe the electron-electron interactions between any energy intervals. The key is to obtain the Vnn'kk', normalized by density of states, and sum over all bands and k points. So far, after Kel calculation I could only get the u value projected on the Fermi Surface which equals V(0,0) according to the letter above. Is there any way to export V(e,e') directly in current version?

Yours,
Nintendo-64