Hi Pascal: I did some testing and found that, when you graph more than one variable, the scale on the left side needs to adjust so you can see all the graphs fitting into one area.
The normalized value for a parameter is scaled relative to the maximum value for that particular parameter. You can think of the normalized values as "..the percent of maximum, for that parameter".
Loop 1: stress = 29 ksi.
Loop 2: stress = 35 ksi.
Loop 3: stress = 42 ksi.
The maximum value for this parameter is 42 ksi (from loop 3).
So the normalized value will scale the results as:
Loop 1: normalized stress = 29/42 = 0.69 [so this is 69% of the maximum]
Loop 2: normalized stress = 35/42 = 0.83 [this is 83% of the maximum]
Loop 3: normalized stress = 42/42 = 1.00 [this is 100% of the maximum]
I hope that helps, but let us know!