Thanks to many colleagues who have shared cross section data with me over the last two decades, in particular John Black, Alex Dalgarno, Kate Kirby and Eric Herbst. I am also much indebted to Marc van Hemert, for computing and helping me to compute, energies and transition moments of several species and to Wayne Roberge for providing his radiative transfer program to compute depth-dependent rates.

Thanks to Maria Kirsanova for making a comparison with the AMOP cross sections and Sander de Kievit for designing the Website.