Don't know if I can explain this properly but I have two sets of data, I want to graph on the same plot. Each set is millivolts vs. temperature. The milllivolts is my Y axis, the temp my X. Problem is each data point is not taken at the same temp point for each set so when you plot them together the two plots don't sync. Can a secondary X axis be done and if so how as that would solve my problem. Or can I somehow set a temperature range on the x axis that both sets of data would be true too.

Thanks. Hope that wasn't too confusing