Top left: adjusted velocity field v(r) (contours) over-imposed on broadband image B(r) (gray) of galaxy #1134 from the GLASS survey. Top right: input observed (gray) and modeled (contours) peak-normalized spectrogram, centered on the Hα+[N II]+[S II] complex. Red dashed lines represent the adjusted rotation curve at the Hα position. Given the poor kinematic sampling, the offset induced by the kinematics is only ± ∼ 0.5 px. Bottom left: residual map for model without kinematics. Bottom right: residual map after adding kinematic parameters to the model. Black cross represents position angle of the galaxy at Hα emission line position and the dotted line the spectral trace. The decrease in the χ² corresponds to a 12.7σ kinematic signature detection.