Custom Error Bars

I am trying to insert error bars to my graph but I am having difficulty. The error in the y-axis is the same for all the points in the graph so I was able to do that quite easily. However, the error in the x-axis is different for each inividual point on the graph. Is there a way of entering the error values individually for each point? Do I use the 'custom' setting in the error bar options? But I have not worked out how to use this. I am using excel 2007.

Thanks for any help.

Thanks for the link. I read through it though I'm still not sure exactly what I'm supposed to do.

For example I want the x-axis error in the first data point to be plus and minus 0.03, in the second point it should be plus and minus 0.02, in the third point it should be plus and minus 0.05 etc... How do I do that? This is the first time I've attempted this so some detail instructions would be appreciated.

Ok. Here's my attempt. Vertical error bars are fine sine they have a fixed value. I have entered the horizontal error bar values in column C. In the horizontal error bar options I selected custom and then selected all the error values in column C as the value for both positive and negative error (after deleting the default entry). The error bars however still don't much the values in column C.

Thanks again.

Thanks. I guess I just posted it in a hurry without looking at it too carefully. Also I probably expected it to be wrong because its was my first attempt at doing this.

Anyway thank you. I now know how it works.