Tip to Tail Function and Display Attributes
- 
                From the Tip to Tail panel, under Based on, select All,
                        Displayed or Selected for your
                    selection method.
                
- All
 - Bases the definition on all curves in the session. Manual selection of curves is not permitted.
 - Displayed
 - Bases the definition only on the curves displayed in the window. You
                                can select curves manually. To remove a curve from the calculation
                                process, select the curve(s) from the Available curves list and
                                click the forward arrow, 
, to move the
                                curve(s) to the Exclude column. - Selected
 - Bases the definition only on the curves that you select from the list.
 
 - Once you've chosen your selection method, the tip-to-tail function is calculated and displayed on the polar plot.