logr25 is the axis ratio of the isophote 25 mag/arcsec2
in the B-band for galaxies (decimal logarithm of the ratio of the
lengths of major to minor axes).
The length of the major axis is defined in the parameter
logd25, and its orientation on the sky in the parameter
pa.
logr25 is available for 934041 objects (May 2003 version of
the database).