Woof,
I'll try to look up how to do that before I trouble you for more info, but thanks for the suggestion.

Chinbok,
Know it wasn't a question to me but when analysing data I use sr some times and POT others (although it gives me a headache the next day). Trouble with POT is a big winner in a small sample causes a lot of trouble. s/r gives a smoother curve. Often I use a meld of the two - multiplied as you suggest or a ratio or whatever.

KV