Graph View - y axis should be same when variables have same units

jirikadlec2[CodePlex]
In HydroDesktop I downloaded quotTemperaturequot and quotTemperature, Dew Pointquot from Provo, Utah. When I show the both time-series in the graph, the left-hand y-axis shows the quotTemperaturequot and the right-hand y-axis shows the quotTemperature,
Dew Pointquot. In the graph, the quotTemperature, Dew Pointquot looks higher than quotTemperaturequot which is not quite possible. I was looking at the graph for a couple of minutes before I realized that it's due to the two different axes!

Suggested correction is:
If there are two different variables but both have the same units, they should share the same y-axis in the graph view.

Start by reproducing the Graph View with Temperature and Temperature, Dew Point from Provo, Utah, then inspect the graphing code that assigns y-axes to plotted variables. Done means variables with the same units share one y-axis and no longer appear to have different scales.

Written by the indexing model from the issue text.