  We construct maps of the oxygen abundance distribution across the disks of 88
galaxies using CALIFA data release 2 (DR2) spectra. The position of the center
of a galaxy (coordinates on the plate) were also taken from the CALIFA DR2. The
galaxy inclination, the position angle of the major axis, and the optical
radius were determined from the analysis of the surface brightnesses in the
SDSS $g$ and $r$ bands of the photometric maps of SDSS data release 9. We
explore the global azimuthal abundance asymmetry in the disks of the CALIFA
galaxies and the presence of a break in the radial oxygen abundance
distribution. We found that there is no significant global azimuthal asymmetry
for our sample of galaxies, i.e., the asymmetry is small, usually lower than
0.05 dex. The scatter in oxygen abundances around the abundance gradient has a
comparable value, $\lesssim 0.05$ dex. A significant (possibly dominant)
fraction of the asymmetry can be attributed to the uncertainties in the
geometrical parameters of these galaxies. There is evidence for a flattening of
the radial abundance gradient in the central part of 18 galaxies. We also
estimated the geometric parameters (coordinates of the center, the galaxy
inclination and the position angle of the major axis) of our galaxies from the
analysis of the abundance map. The photometry-map-based and the
abundance-map-based geometrical parameters are relatively close to each other
for the majority of the galaxies but the discrepancy is large for a few
galaxies with a flat radial abundance gradient.
