Acknowledgements

We are grateful to John Lucey for extensive discussions about photometry and photometric calibration and for providing the example data used in Section . Nick Eaton gave useful advice about PHOTOM and Peter Draper about GAIA. Chris Clayton, Malcolm Currie, Simon Dye, Rachel Johnson, Mike Lawden, Sandy Leggett and Ian Waddington all made useful comments on the cookbook.

Any mistakes are, of course, our own.