  The bounds on the neutrino mixing angles and CP Dirac phase for an SO(10)
model with lopsided mass matrices, arising from the presence of ${\bf 16}_H$
and $\bar{\bf 16}_H$ Higgs representations, are studied by variation of the one
real and three unknown complex input parameters for the right-handed Majorana
neutrino mass matrix. The scatter plots obtained favor nearly maximal
atmospheric neutrino mixing, while the reactor neutrino mixing lies in the
range $10^{-5} \lsim \sin^2 \theta_{13} \lsim 1 \times 10^{-2}$ with values
greater than $10^{-3}$ most densely populated. A rather compelling scenario
within the model follows, if we restrict the three unknown complex parameters
to their imaginary axes and set two of them equal. We then find the scatter
plots are reduced to narrow bands, as the mixing angles and CP phase become
highly correlated and predictive. The bounds on the mixing angles and phase
then become $0.45 \lsim \sin^2 \theta_{23} \lsim 0.55$, $0.38 \lsim \tan^2
\theta_{12} \lsim 0.50$, $0.002 \lsim \sin^2 \theta_{13} \lsim 0.003$, and
$60^\circ \lsim \pm \delta_{CP} \lsim 85^\circ$. Moreover, successful
leptogenesis and subsequent baryogenesis are also obtained, with $\eta_B$
increasing from $(2.7 to 6.3) \times 10^{-10}$ as $\sin^2 \theta_{23}$
increases from 0.45 to 0.55.
