Thank you! I had figured a workaround using the top axis and putting in a dummy series for the bottom axis, but this works much better and requires much less maintenance. Thanks so much!

Teri

Hello - I'm charting recovery fractions for analyzed samples over time; data is contained in a data table. The X-values point to the Date-Time field, the Y-values are the recovery fractions. Each data point, though, also has a unique Sample Number that I'd like to access and possibly display at the ...