  It is well known that charged black $Dp$ branes of type II string theory
share a universal phase structure of van der Waals$-$Maxwell liquid-gas type
except $D5$ and $D6$ branes. Interestingly, the phase structure of $D5$ and
$D6$ branes can be changed to the universal form with the inclusion of
particular delocalized charged lower-dimensional branes. For $D5$ branes one
needs to introduce delocalized $D1$ branes, and for $D6$ branes, one needs to
introduce delocalized $D0$ branes to obtain the universal structure. In a
previous paper [J. High Energy Phys. {\bf 04} (2013) 100] Lu with Wei study the
phase structure of black $D6$ branes with the introduction of delocalized $D0$
branes in a special case when their charges are equal and the dilaton charge
vanishes. In this paper, we look at the phase structure of the black $D6/D0$
system with the generic values of the parameters, which makes the analysis more
involved but the structure more rich. We also provide reasons why the
respective modifications of the phase structures to the universal form for the
black $D5$ and $D6$ branes occur when specific delocalized lower-dimensional
branes are introduced.
