\section*{Acknowledgements}

Thanks to Martin~Bly and David~Berry
% {\sf + others}
for useful discussions and/or comments on the draft.
The recipe in Section~\ref{ASTROM_RECIP} is based on one originally written
by David~Berry and the one in Section~\ref{PHOTOM_RECIP} on one originally
written by John~Palmer.  Karen Moran kindly unearthed the contact details
for Twin Press.

Any mistakes, of course, are our own.

% References ----------------------------------------------------------

% \newpage
% \section{References}

% \input{refs.tex}
\newpage
\addcontentsline{toc}{section}{References}
\begin{thebibliography}{99}

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  \bibitem{BERTIN96} E.~Bertin and S.~Arnouts, 1996, {\it Astron.
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  \bibitem{SUN226} A.J.~Chipperfield and P.W.~Draper, 14 September 2001,
   \xref{SUN/226.4}{sun226}{}: {\it EXTRACTOR --- An Astronomical Source
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  \bibitem{SUN55} M.J.~Currie, G.J.Privett, A.J.Chipperfield,
   D.S.~Berry and A.C.~Davenhall, 1 November 2001,
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   Package}, Starlink.

  \bibitem{SUN190} A.C.~Davenhall, 4 November 2001,
   \xref{SUN/190.10}{sun190}{}: {\it CURSA --- Catalogue and Table
   Manipulation Applications}, Starlink.

  \bibitem{SSN75} A.C.~Davenhall, 26 July 2000,
   \xref{SSN/75.1}{ssn75}{}: {\it Writing Catalogue and Image Servers for
   GAIA and CURSA}, Starlink.

  \bibitem{SC5} A.C.~Davenhall, G.J.~Privett and M.B.~Taylor, 16 August 2001,
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   Starlink.

  \bibitem{SUN214} P.W.~Draper, N.~Gray and D.S.~Berry, 13 September 2001,
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  \bibitem{SUN139} P.W.~Draper, M.B.~Taylor and A.~Allan, 22 October 2001,
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  \bibitem{SUN45} N.~Eaton, P.W.~Draper and A.~Allan, 30 December 2000,
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  \bibitem{JAFFE98} W.~Jaffe, 1998, {\it Astronomical Images}\,
   (Twin Press: Vledder) CD-ROM.  To contact Twin Press send an electronic
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% \begin{latexonly}
%  See URL: {\tt http://www.twinpress.nl/index.htm}
% \end{latexonly}

  \bibitem{KAY95} D.C.~Kay and J.R.~Levine, 1995, {\it Graphics File
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  \bibitem{SUN166} R.~Morris and G.J.~Privett, 6 December 1996,
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  \bibitem{SG12} R.~Morris, G.J.~Privett and A.C.~Davenhall, 2 December 1999,
   \xref{SG/12.2}{sg12}{}: {\it An Introduction to IRAF}, Starlink.

  \bibitem{SC6} J.~Palmer and A.C.~Davenhall, 31 August 2001,
   \xref{SC/6.4}{sc6}{}: {\it The CCD Photometric Calibration Cookbook},
   Starlink.

  \bibitem{RC3} G.H.~de~Vaucouleurs, A.~de~Vaucouleurs, H.G.~Corwin,
   R.J.~Buta, G.~Paturel and P.~Fouqu\'{e}, {\it Third Reference
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  \bibitem{SUN56} P.T.~Wallace, 21 June 1995, \xref{SUN/56.10}{sun56}{}:
   {\it COCO --- Conversion of Celestial Coordinates}, Starlink.

  \bibitem{SUN33} R.F.~Warren-Smith, 11 January 2000,
   \xref{SUN/33.7}{sun33}{}: {\it NDF --- Routines for Accessing the
   Extensible N-Dimensional Data Format}, Starlink.

  \bibitem{SUN210} R.F.~Warren-Smith and D.S.~Berry, 23 October 2001,
   \xref{SUN/210.11}{ssn20}{}: {\it AST --- A Library for Handling
   World Coordinate Systems in Astronomy} (Fortran Version), Starlink.

  \bibitem{SUN211} R.F.~Warren-Smith and D.S.~Berry, 23 October 2001,
   \xref{SUN/211.11}{ssn20}{}: {\it AST --- A Library for Handling
   World Coordinate Systems in Astronomy} (C Version), Starlink.

  \bibitem{SSN20} R.F.~Warren-Smith and D.S.~Berry, 17 July 2000,
   \xref{SSN/20.3}{ssn20}{}: {\it Adding Format Conversion Facilities to
   the NDF Data Access Library}, Starlink.

  \bibitem{WELLS81} D.C.~Wells, E.W.~Greisen and R.H.~Harten, 1981,
   {\it Astron. Astrophys. Suppl}, {\bf 44}, pp363-370.

\end{thebibliography}

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