Fixed-β MBB fitting (β = 1.5) for the whole sample of Virgo dwarfs detected with Herschel (black solid line). The reduced χ² value of the fitting is displayed at the upper-right corner of each plot. The VCC catalogue ID is given at the lower-left corner of each plot. The red dotted lines correspond to the MBB obtained by fitting only three points of the SED (160–350 μm) instead of four points (100–350 μm). The three-point fits are shown only for those galaxies where the difference between the dust masses derived with the two methods, , is larger than ~0.1 dex, the mean uncertainty on .