\begin{table}%t2
%\centering
\par
    \caption{\label{tab:pimms}Best fit parameters for power law models applied to the
      summed spectra of the faint sources in each of the disc fields.
      We show the total number of faint sources in each field, the
      power law photon index, $\Gamma$, $\chi^2/$d.o.f. and for which
      camera this fit was found. The absorption was fixed to $0.10
      \times10^{22}$~H~atom~cm$^{-2}$ for each field.  The bracketed
      numbers are the error in the last significant figure.  Where we
      quote two conversion factors, the first is for the pn camera and
      the second for the MOS. Errors are unavailable for the best fit
      power law index to South~1 as the $\chi^2/$d.o.f. is $>$2.}
    \small    \begin{tabular}{c c c c c c}
            \hline  \hline\\[-3mm]
            Field & Number of & $\Gamma$ & $\chi^2/$d.o.f. & Camera(s) used & Conversion factor\\
       & faint sources & & & & erg~s$^{-1}$/counts s$^{-1}$ \\
   \hline\\[-3mm]
         North~3 & 19 & 2.8(13) & 161/122 & pn/MOS & $5.71\times10^{38}$/$9.33\times10^{38}$\\
      North~2 & 32 & 1.5(4) & 39/38 & pn/MOS & $3.58\times10^{38}$/$7.82\times10^{38}$\\
      North~1 & 11 & 1.00(15) & 24/16 & MOS & $5.73\times10^{38}$\\
      South 1 & 16 & 1.3(--) & 450/120 & pn & $4.75\times10^{38}$\\
      South 2 & 17 & 1.3(4) & 56/46 & pn & $4.54\times10^{38}$\\
      \hline
      \end{tabular}
           \end{table}