How about adding horizontal lines to denote the boundaries?
Could use one of these methods:
http://peltiertech.com/Excel/Charts/...orzErrBar.html
http://peltiertech.com/Excel/Charts/...orzSeries.html
best wishes
--
Bernard Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
"mrsatroy" <(E-Mail Removed)> wrote in message
news:2582E39F-19B9-41DB-B65D-(E-Mail Removed)...
> I am working in a microbiology lab and am plotting on a bar chart zone
> size
> versus number of isolates. The size of the zone determines whether or not
> an
> organism is sensitive, intermediate or resistant to an antibiotic. I would
> like to be able to illustrate on the graph which area on it pertains to
> resistance/intermediate/sensitive. At the moment I just have a list of the
> zone sizes on the Y axis but it would be great if there was a visual
> representation on the chart area of where the different interpretations
> began
> and ended, inother owrds to almost divide the graph into 3 areas with the
> columns in each area. Hope this makes sense!
> --
> mrsatroy