Enlargement of the ridge nebular feature located south of RS Pup. Top row: EMMI intensity image (left, W m^-2 μm^-1 sr^-1, linear scale) and p_L map (right, with 2.5% spacing contours starting at 0). Bottom row: altitude of the dust layer (left, in pc, with 0.05 pc contours) and dust column density (right, 10⁵⁴   H   arcsec^-2, with 10 unit contours). The field of view is 44 × 44″, corresponding to 0.4 × 0.4 pc at the distance of RS Pup.