JAM model for galaxy NGC 3957. The upper row shows the V_rms map, the central row shows the V map, and the lower row shows the σ map. The left column shows nGIST mean light-weighted velocity V and σ binned to S/N = 100, as well as the derived quantity $V_{\text{rms}}=\sqrt{V^2+{\sigma }^2}$. The central column shows the dynamical model, and the right column shows the residuals (data minus model). The model is fit to the V_rms map, and a κ value is fit to find the V map from V_rms. Additionally, we circle structures in the V residual map that we believe corresponds to kinematic components, which JAM failed to successfully model.