Fig. 27.
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Relative distributions of the bulge-over-total stellar mass ratio for early spirals and lenticulars. Each color represents a specific Hubble type (or a combination of subsequent Hubble types). Despite a large dispersion, B/T systematically increases with morphological type. In particular, transformation of Sb types into S0−-S0 or S0+-S0a often requires bulge growth.
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