Top: input observed (gray) and modeled (contours) peak-normalized spectrogram of galaxy #451 from the GLASS survey for which Hα complex (right frame) and [O III] doublet (left frame) are simultaneously adjusted. Bottom: residual map for model with kinematics centered on [O III] doublet (left) and on Hα+[N II]+[S II] complex (right). The black crosses represent PA of the galaxy at [O III] and Hα emission line positions. The decrease in the total χ² corresponds to a joint detection at 13.2σ.