\begin{table}%T4
\caption{The black hole masses of the RQQs$^a$.}
\label{bhmass}
%\centerline
 {\small
\begin{tabular}{lc}
\hline\hline\\[-3.2mm]
%\noalign{\smallskip}
Object & $M_{\rm BH}/10^{9}~M_{\odot}$\\
%\noalign{\smallskip}
\hline
%\noalign{\smallskip}
HS 0010+3611   & 0.5 \\
1E 0112+3256   & 1.3 \\
PB 6708        & $<$0.7 \\
KUV 03086-0447 & 2.0 \\
US 3828        & 0.5 \\
MS 08287+6614  & 0.7 \\
TON 392        & 1.3 \\
US 971         & 0.4 \\
HE 0955-0009   & $<$0.9 \\
HE 1100-1109   & 2.2 \\
CSO 769        & 1.1 \\
HS 1623+7313   & 0.3 \\
HS 2138+1313   & $<$1.0 \\
LBQS 2249-0154 & 1.2 \\
ZC 2351+010B   & 0.5 \\
%\noalign{\smallskip}
\hline
\end{tabular}}
\medskip
$^a$ Transformations of magnitudes to $R$-band done assuming $R-H = 2.5$.
\end{table}