Column density N(H₂) (frame a), dust temperature T_dust (frame b), and J-band extinction A_J (frame c) of LDN 1642. The resolution of the maps is indicated by the circles in the lower left corner. The values of N(H₂) and T_dust are based on MBB SED fits to Herschel SPIRE data, after background subtraction. The red circle in frame a shows the reference region used for the background estimation. Areas with low column density have been masked in the plots (white pixels). The labelled stars indicate the locations of embedded sources B1–B3.