NTE wrote on 7 Dec 2005 07:59:25 -0800:

N And the points do seem to plot ok, I just don't understand
N why I'm getting the message. Those values are medians for
N certain electrolytes, and I am trying also to plot error
N bars using min/max for each category. I can get a plus
N error bar but not a minus, and I was wondering if the error
N about negative or zero values was impacting that.

N Thank you for your input.

I don't know for sure but I think it is possible. I must say
I've never tried to plot error bars on a log chart and haven't
got the time to experiment just now.

Good luck!

James Silverton.