Comparison between L_dust measured with the fit of the IR data only (MIPS to ALMA, x-axis), with the fit of the full SED (dots, y-axis), and with the fit of the stellar continuum only (filled squares for GS galaxies and empty squares for UDF galaxies, y-axis). The 1σ errors given by CIGALE for the fit of the stellar continuum are plotted as vertical and horizontal lines. The blue crosses correspond to L_dust values obtained with the slope of the UV continuum. The solid line represents equal quantities on both axes, and dashed and dotted lines represent a L_dust respectively three and ten times lower on the y-axis.