Shows the influence of the levels of each factor in the Design of Experiment.
The black line in the graph is the mean value of the factor, and the two gray lines are the mean plus and minus the STDEV. Looking to this graph the influence of various configurations (levels) of a factor mean and variation is visible.
In the interaction graph the influence on the variation is not visible.
By Right Clicking on the graph the plus minus STDEV can be turn off.