Dongmin Gang, Masahito Yamazaki Journal of High Energy Physics 02 (2020) 102 https://doi.org/10.1007/JHEP02(2020)102 Abstract We study a perturbative expansion of the squashed 3-sphere (S_b^3) partition function of 3d N = 2 gauge theories around the squashing parameter b = 1. Our proposal gives the coefficients of the perturbative expansion as a finite sum over the saddle points of the supersymmetric-localization integral in the limit b → 0 (the so-called Bethe vacua), and th