I have the following source data for a stacked column bar chart. Each name
is a series and the dates are on the category axis. I'm trying to sort the
bars so that on the 30-Jun bar, for example, sam would be on top, the Peg,
etc. I've tried several suggestions on this site, to no avail. Can someone
help with my example? Thanks.

scott brian june peg sam
30-Jun 0 5 0 6 11
11-Jul 1 8 3 11 4
18-Jul 8 5 6 2 5