  The distribution of asteroid sizes by semimajor axes and the distribution of
the number of asteroids by albedo values for separate families are used to
selection the asteroid families more clearly. An analysis of the families
identified by Masiero et al. (2013) was carried out with the use of the
distributions of D(a) and N(p), there were defined correctly and incorrectly
selected families. A decreasing of the mean albedo with semi-major axis
increasing take place almost for all correctly selected families and which are
not truncated by resonances. The decrease is statistically significant for the
majority of these families. There is none family at a significant increase of
albedo. This confirms our previous conclusion on existence of a
non-gravitational effect in the asteroid belt which causes the spatial
separation of asteroids with different albedos.
