Cheers Gant. I like 'em too. Because often moonlight,I didn't worry about the faint outliers so concentrated on not blowing out the core.
Alistair, check out this HST photo of 47 Tuc. Colours are really clear.
http://www.daviddarling.info/encyclo...7_Tucanae.html. This is an interesting page from the astrophysics course at Durham.
http://www.dur.ac.uk/ian.smail/gcCm/...ntro.html#Aims