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#### A.4.4.1 Position Layer Control

The Position layer control () is available for all the plot types (except the Corner Plot, which uses the similar Matrix control). Most plots start off with one of these in the stack by default, and you can add a new instance by using the Add Position Control () button in the control panel toolbar, or the corresponding item in the Layers menu.

This is the control which is used for most of the data plotting in the plotting windows. Each instance of this control in the stack does plotting for a particular set of positions from a single table. The set of positions is defined in the Positions tab as a column name or expression for each plot coordinate (e.g. for X and Y in a plane plot). However, the control can generate multiple layers from these positions; the Subsets tab controls which subsets are plotted and how each one is identified, and the Form tab provides many options for what graphics will be plotted based on the positions.

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