This window allows you to edit the appearance of the plots in the window. You can change its name in the upper field. Click in the squares to change the data markers, line weight, and color. The markers show the points actually calculated.
To read the value of the plot at any point, just move the cursor over the main plot region and move it around. The values will appear in the upper data box. Note that the program provides linear interpolation between the calculated data points.
