How do I get two rows of labels on the horizontal axis, one of which is a subset of the other? In the picture attached (a bit fuzzy I know), Glucose and Xylose are plotted for experiments that took 12 hours, and experiments that took 24 hours. I don't know how to do this, and I don't have the original workbook.
I tried for hours using secondary axes, but I am not sure that's what this is.
[Solution: http://peltiertech.com/WordPress/cha...ategory-axis/]
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