\begin{table}
\caption{Polarization data for four groups of peculiar O-type
stars observed during the AAT and WHT runs described in the body
text.} \label{t_cont}
%\centerline
{
\begin{tabular}{lccccccccc}
\hline
Name & Spec.Tp & Date & $P_{\rm cont}^{\rm R}$ (\%) & $\theta_{\rm cont}^{\rm R}$ (\degree)
& $P^{\rm lit}$ (\%) & $\theta^{\rm lit}$ & $P^{\rm IS}$ (\%) & $\theta^{\rm IS}$ & ISP map\\
\hline
\\
\multicolumn{10}{l}{(I)~~{\it OVz and weak wind dwarfs}}\\
$\Theta^1$ Ori C & O7 Vp & 31-12-95 &$0.31 \pm 0.01$ & $139.9 \pm 0.3$ &  &  &  & & \\
                &           & 01-01-96 &$0.29 \pm 0.01$ & $148.2 \pm 0.8$ &  &  & & &  \\
                &           & 31-12-96 &$0.29 \pm 0.01$ & $144.0 \pm 0.6$ &  &  & & &  \\
                &           & 14-02-03 &$0.284 \pm 0.005$ & $136.3 \pm 0.5$ & 0.35 & 151.8 & 0.240 & 88.5 & No\\
$\Theta^2$ Ori A & O9.5 Vpe   & 14-02-03 &$1.051 \pm 0.005$ & $99.7 \pm 0.1$ & 0.702 & 93.1 & 0.221 & 88.5 & No\\
HD 42088 & O6.5 V  & 14-02-03 &  $2.431 \pm 0.008$ & $177.0 \pm 0.1$ & 2.53 & 178 & 2.126 & 168.8 & OK \\
HD 54662  & O6.5 V & 14-02-03 & $0.881 \pm 0.098$ & $145.5 \pm 3.8$& 0.83 & 145 & 0.481 & 154.4 & No\\
HD 93128  & O3.5 V((f+)) &  12-02-03 & $2.265 \pm 0.014$ &  $89.0 \pm 0.2$ &      &      &       &\\
HD 93129B & O3.5 V((f+)) & 12-02-03 &$1.889 \pm 0.063$ & $117.5 \pm 1.0$ &      &      &       &\\
HD 152590 & O7.5 V & 14-02-03 & $0.998 \pm 0.009$ & $29.1 \pm 0.3$ & 0.96 & 19.2 & 0.737 & 27.9 & No\\
CPD-58\degree 2611 & O6 V((f))     & 13-02-03 & $2.222 \pm 0.010$ &  $84.7 \pm 0.1$ &      &      &       &\\
CPD-58\degree 2620 & O6.5 V((f))   & 14-02-03 & $1.717 \pm 0.009$ &  $90.6 \pm 0.1$ &      &      &       &\\
\\
\multicolumn{10}{l}{(II)~~{\it Of?p}}\\
HD 148937     & O6.5 f?p  & 12-02-03 &  $1.580 \pm 0.020$ &  $46.9 \pm 0.4$ & 1.63 & 50.6 & 1.727 & 36.1 & OK\\
              &           & 15-08-03 &  $1.803 \pm 0.014$ &  $49.3 \pm 0.2$ &      &      &       & & \\
\\
\multicolumn{10}{l}{(III)~~{\it Oe stars}}\\
HD 45314 & O9:pe  & 14-02-03 &  $1.316 \pm 0.091$ & $167.4 \pm 2.0$  & 1.38 & 171 & 1.369 & 171.6 & OK \\
HD 46485  & O7 Vn(e) & WHT 03   &  $1.887 \pm 0.013$ & $26.1 \pm 0.2$    & 1.89 & 159.0 & 0.808&165.8& OK\\
HD 60848  & O8 V:pev & WHT 03   &  $0.431 \pm 0.007$ & $35.7 \pm 0.4$& 0.78 & 56  & 0.372 & 27.0  & No\\
HD 120678 & O8 III:nep & 13-02-03 &  $1.637 \pm 0.015$ & $77.8 \pm 0.3$    & 1.7  & 76  & 1.781 & 71.7  & OK\\
Zeta Oph & O9.5 Vnn  & 14-02-03 &  $1.572 \pm 0.004$ & $127.3 \pm 0.1$ & 1.42 & 127 & 0.411 & 76.4  & No\\
HD 155806 & O7.5 V[n]e & 14-08-03 &  $0.821 \pm 0.013$ & $156.4 \pm 0.5$   & 0.86 & 147 & 0.742 & 159.0 & OK\\
\\
\multicolumn{10}{l}{(IV)~~{\it Onfp}}\\
HD 152248 & O7 Ib:(n)(f)p  & 15-08-03 & $0.477 \pm 0.016$  & $114.9 \pm 1.0$ & 0.66 & 112 & 0.812 & 27.9 & OK\\
\hline\\[-3mm]
\end{tabular}}
The spectral types are taken from the O-star catalogue of
Maiz-Apellaniz et~al. (\cite{Maiz-Apellaniz2004}) and listed in
Col.~2, with the dates of the observations  provided in the third column. The errors in the polarization data
(Col.~4) are
of the order of 0.01\% based on photon-statistics only. Yet,
systematic (external) errors in the polarization are estimated to
be 0.1\%. The errors in the PA $\theta$ (Col.~5)
are of order a degree. The
literature values of the polarization and PA are taken from the catalogue of Mathewson et~al.
(\cite{Mathewson1978}) and so are the values for the ISP
(Cols.~8 and 9). The last Col.~10 indicates whether an ISP map is well
ordered and well populated (see body text in
Sect.~\ref{s_res} for more detailed explanation).
\end{table}