Linear diameters require knowledge of both the apparent diameters and
the true distance. Apparent diameters are not uniquelly well defined,
and distances are still generally quite uncertain. The standard
compilation of diameters defined ata a variety of isophotes is
[RC3]. Redshifts combined with an adopted Hubble constant can be used to
derive distances for galaxies well beyond (> 2-3,000 km/sec, say) the
obvious perturbations of nearby clusters (*e.g.*,
Virgo).

It has been demonstrated
[Sand70] that the
observed distribution of axial ratios for elliptical galaxies could
result from an intrinsic distribution R(a) where the *R(a)* = 0.0
for 0 < *a* < 0.3 and *R(a)* = 1.0 elsewhere, or from an
intrinsic Gaussian distribution with a mean ellipticity *< a >* =
0.65 and ~ 0.2.

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