The line/FIR ratio versus: left: 60/100 colors; middle: L_FIR; right: L_FIR/M(HI)_PDRs. Data are for M 82 only. Black points are from the diffuse disk; red points from the southern outflow; cyan points from the northern outflow and green points from the starburst. The small frames in the last row show the same relation reported in the big frames but only for the points belonging to the disk (black) and the starburst (green). The horizontal lines correspond to the threshold identified by Graciá Carpio et al. (2011) between galaxy with normal (above) and deficient (below) FIR_line/FIR_continuum ratios, or between normal and high efficency of SF. (This figure is available in color in the electronic form.)