  Bellazzini et al. (2006b) claim that Lopez-Corredoira et al.'s (2002) warp
model is totally unable to reproduce the Canis Major structure in the red clump
stars. However, slight variations in the azimuth of the Lopez-Corredoira et al.
(2002) warp model, justified by the uncertainties in the parameter as well as
the local irregularities with respect to the average model, derive a result
much closer to the observations of the overdensity south/north. The bump of red
clump stars with m_K=13-13.5 around l=241 deg., b=-8.5 deg. and the depth of
the Canis Major structure are also explainable in terms of the warp with an
appropriate extrapolation of constant height between galactocentric radii of 13
and 16 kpc, as observed roughly in the southern warp, instead of a
monotonically increasing height like the northern warp; and the observed
velocity distribution of stars cannot exclude the warp possibility. A warp
model is therefore still a possible explanation of the Canis Major overdensity,
and the hypothesis of the existence of a dwarf galaxy is unnecessary, although
still a possibility too.
