Observed distribution of masses for different morphological types computed using different estimators described in the text (see text for details). In the left panel the whole sample is shown using the probability weighting. Red short dashed line: ellipticals; yellow dashed dotted line: S0s; green dashed three dotted line: Sabs; blue long dashed line: Scds. In the right panel, we show galaxies flagged as SPIRAL and ELLIPTICAL in the galaxy zoo. Red solid lines are galaxies flagged as ellipticals in Galaxy Zoo (FLAG ELLIPTICAL = 1), red dashed line is the distribution obtained using probability weighting and red dots are galaxies with p(E) > 0.5. Blue solid lines are galaxies flagged as spirals (FLAG SPIRAL = 1) in the Galaxy Zoo, blue dashed line is the distribution obtained using probability weighting and blue dots are galaxies with p(Sab) + P(Scd) > 0.5.