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### A.4.4 Layer Controls

The layer controls are controls in the Control Stack that can be added, removed and moved around to determine what layers go to make up the contents of a plot. You can have zero, one or several of each. Which ones are available is dependent on which plot type you are using (for instance the Spectrogram control is only available for the Time plot). Add instances of each control to the control stack by using the appropriate button from the control panel toolbar (the one in the lower half of the window) or the corresponding item in the Layers menu.

The available layer controls are described in the following subsections. More may be added in future releases.

- A.4.4.1 Position Layer Control
- A.4.4.2 Pair Position Layer Control
- A.4.4.3 Quad Position Layer Control
- A.4.4.4 Matrix Layer Control
- A.4.4.5 Healpix Layer Control
- A.4.4.6 Histogram Layer Control
- A.4.4.7 Area Layer Control
- A.4.4.8 Spectrogram Layer Control
- A.4.4.9 XYArray Layer Control
- A.4.4.10 Function Layer Control
- A.4.4.11 SkyGrid Layer Control
- A.4.4.12 SphereGrid Layer Control

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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