negative values on bar charts

[Sytske Kimball]

All,
 
I am trying to plot a bar chart that has both positive and negative values (the difference between 2 rain gauges
at a certain site). So I set my y-axis range from -5 to +5 and hoped to see bars originating at the zero line and
going up or down depending on whether the rain difference is positive or negative, respectively. But that didn't
happen. All bars originated at the -5 line and stopped at whatever negative or positive value was assigned to them.
Any ideas how I could change this?
 
Thanks in advance,
Sytske
 
 
 
 
Sytske Kimball
Associate Professor of Meteorology
Dept. of Earth Sciences
University of South Alabama
Mobile, AL
phone (251) 460-7031 
       or (251) 445-4294
fax       (251) 460-7886
email   skimball at usouthal.edu 
web:   http://chiliweb.southalabama.edu/
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