Example pv–diagrams along the major and minor kinematic axes of NGC 3627 (top) and NGC 4654 (bottom) used to search for outflows. The color scale represents the intensity at a given position along the offset averaged over a width of 3 pixels. The contours are multiples of the noise at 2.5σ, 3.5σ, followed by n_iσ with n_i = 2n_i − 1, for n₀ = 2.5σ and i = 1, 2, 3, …. The color range is saturated to emphasize the faint emission we are interested in. The pv–diagrams of NGC 3627 (NGC 4654) correspond to OCLs of 3, 2, 2 (0, 0, 0) from the three different inspectors. The systemic velocity (yellow horizontal line) is added for comparison and is subtracted from the velocity axis.