When the beta line grid is defined, then you can work with the efficiency lines. You get a graph on your screen that shows the data points of three efficiency lines and all beta lines. In working mode you can modify the blue line with your mouse, while in zoom mode you can adjust your view.

The shape of the efficiency lines can be checked with many cross plots. Especially useful is the check with the loss characteristics that show the losses over meaningful parameters.

With a big screen one can see four graphics simultaneously while working with efficiency: