Andy,

thanks for your note. I tried setting the error bar to the series and then selecting data points separately, but the formatting options available for the separate data points does not include an ability to reset the error bar fro each data point.

can you give me a sense of how I might over lap data series to accomplish your second workaround. I can see repeating the same series 4 times and maybe I could mess with the separation settings to get them to overlap and then select the data points/error bars that I don't want to show at other trial locations in my bar graph and give them a color of "none" and a line color of "none"

but that seems pretty cumbersome.

maybe I could make each trial a separate series and because of ascending time values it would still disperse them along the x-axis instead of on top of each other. I don't know. I'll try a few things, but any specfic hints would be great.

I'm also going to give this a try on an IBM, although the version I have on an IBM is older, I can't remember which one. Does the IBM version allow you to separately select the error bars for a particular data point? That would seem to be the sensible approach, but on a Mac, even though I can select separate data points, selecting any one error bar selects them all.

Thanks again,

Brian