Figure 2
From: Cooper Pairs Distribution function for bcc Niobium under pressure from first-principles

Eliashberg function \((0{-}10\,{\text{GPa}})\) for Niobium. Right arrow signs \({\alpha }^{2}F(\omega )\) hardening. Soothing interval of \({\alpha }^{2}F(\omega )\) (left arrow) is highlighted.