Profile of A_V, the attenuation by the foreground matter, across the PDR front, derived from H₂ line ratios. The signal was averaged over the width of the maps and four columns of pixels to compute H₂ maps with sufficient S/N. Within 1^′′ and beyond 14^′′ from the front, H₂ emission is too faint to derive A_V. The value of A_V increases from the edge of the PDR to the second and third H₂ filaments.