Figure 2
From: Transition in the Equilibrium Distribution Function of Relativistic Particles

Bose-Einstein (λ = –1), Maxwell-Jüttner (λ = 0) and Fermi-Dirac (λ = 1) velocity distributions, for d = 1, according to equation (1).
The distributions correspond to a relativistic fluid, with group velocity U = 0 and two different temperatures (T = 1/ξ), namely, ξ = 1 and ξ = 20.