H₂ column density maps of Lupus I, III, and IV in units of 10²⁰   cm^-2 with A_V contours overplotted. For Lupus III and IV the contours are A_V =  2, 3, 6, and 9 mag, while for Lupus I the contours are 4, 6, and 9 mag (to avoid the stray Moonlight). The different classes of objects, from the Herschel data and from the M08 catalog, are indicated. The off-cloud candidate Class I sources, marked by an asterisk, are those we considered as possible galaxy contaminations (shown by a dashed line in Fig. 3). The one off-cloud Class I in Lupus I without an asterisk has strong 24 μm emission, so is less likely to be a galaxy. Dashed contours mark the Spitzer MIPS coverage.