H₂ rotational diagrams for the outflow positions in WL 17, [GY92] 197, ISO-Oph 137, and GSS30-IRS 1 with the largest number of line detections. The natural logarithm of the column density from a level u, N_u, divided by the degeneracy of the level, g_u, is written on the Y axis. The extinction-corrected values are shown in red, and the ones before the correction in blue. The two-component fits cover the transitions below and above E_u∼4000 K for the “warm” (dashed line) and “hot” (dotted line) component (see text). The combined fit is shown as a black line. Finally, letters next to source name mark the aperture where the H₂ were measured.