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#### A.4.4.2 Pair Position Layer Control

The Pair Position layer control () allows you to plot symbols linking two positions in the plot space from the same table. You can add one of these controls to the stack by using the Add Pair Control () button in the control panel toolbar, or the corresponding item in the Layers menu.

This control is particularly useful for visualising the results of a crossmatch, and it is used automatically by the Plot Result () option offered by some of the Match Window results. If you want to plot pairs of points from different input tables, you first have to create a joined table by using one of the crossmatch functions.

It works in a similar way to the Single Position Layer Control, but the Position tab has fields for not one but two sets of coordinates to fill in.

This control is a Table Data control as described in Appendix A.4.2.2. That section explains the Subsets tab; the Position and Form tabs are described in more detail below.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk