Gary,
For the two files which you created 'maths_fns/chi2.h' and 'maths_fns/exponential.h', you have added the copyright statement:
Copyright (C) 2006 Edward d'Auvergne
As there have been no copyright assignments either made or requested it may be best to have your name with an email address on the files such as:
Copyright (C) 2006 Gary Thompson <garyt@xxxxxxxxxxxxxxx>
I should start adding my email address to the copyright statements as well. For every contribution made to the repository the copyright to that code is owned by the contributor. Information about the exact changes, who made it, and when it was made is permanently stored within the repository. In the case of the two files you added I do not own the copyright to them as there has been no copyright transfer statement. Your name would be best on them (unless you don't want it there, in which case you may need to transfer the copyright).
Edward
P.S. Chris, didn't you add a file a while back as well?