Excel 2007, customising error bars

[Alex Kaula]

Hi,

I would like to include error bars for confidence intervals on a line graph, and this involves customising the data points. However, it seems I must apply the interval I choose (using the customise function) to the whole series, and this is no good, as the interval is different for each plotted point.

The graphs would be very simple, plot 6 data points in total, 3 lines with 2 data points for each of the 3 groups, with is a time1 and time2 point on the x-axis and the mean performance score on the y-axis.

Any help with independently adjusting the error bars would be much appreciated.

Thanks,
Alex