Fig. 3
From: Theory of the evolution of superconductivity in Sr2RuO4 under anisotropic strain

Bare susceptibility χ 0(q) vs. the wavevector q for δt/t = 0 (a), 1.5% (b), 3.125% (c), and 4.5% (d). Here, the Brillouine zone is centered at the origin. The arrows indicate strong peaks at a small (large) wavevector q 1 (q 2), and q 1 can be associated with the quasi-nesting vector indicated in Fig. 2