View g Lines
Displays
several lines surrounding a plot. This can be useful when dragging
a plot, to visually compare the minimum , maximum and mean
values of one plot to another. 



g X mean Displays a vertical line at the mean value of all Xvalues of the corresponding data set 

g X center Displays a vertical line at the Xcenter value of a data set 

g Y min / Y max Displays a horizontal line at the top side and at the bottom side of the corresponding data set 

g Y mean Displays a horizontal line at the mean value of all Yvalues of the corresponding data set


g Y center Displays a horizontal line at the Y center value of a data set 