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#### A.4.4.4 Matrix Layer Control

The Matrix layer control () is available only for the Corner Plot. The Corner Plot window starts 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 that supplies all the plots for the Corner plot. Each instance of this control in the stack does plotting for a set of multidimensional points from a single table. The set of points is defined in the Position tab as a column name or expression for each plot coordinate, while the Fill tab provides some controls that can help to fill in in the Position tab. The control can generate multiple different layers from these positions; the Form tab provides many options for what graphics will be plotted based on the positions, and the Subsets tab controls which subsets are plotted and how each one is identified.

This control is a Table Data control as described in Appendix A.4.2.2. That section explains the Subsets tab; the Position, Fill 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