Custom Error Bars

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.