On Fri, 26 Aug 2011, Riccardo (Jack) Lucchetti wrote:
 On Fri, 26 Aug 2011, Allin Cottrell wrote:
> I'll do some more checking tomorrow to confirm that the fix is
> right, but thanks for spotting this!
 Confirmed, the fix looks ok to me.
 I'm attaching a zip file containing Skipper's dataset and a small script 
 performing the relevant computations. 
Thanks, neat script. So I believe we're on the right track 
now.
Allin Cottrell