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### 8.4 Shading Modes

Some plot layer types have an associated `shading` parameter which determines how plotted markers are coloured. This is independent of the marker shapes (which may be points, vectors, ellipses, ...) but may be affected by how many markers are plotted on top of each other, additional input table values, selected colour maps etc. For the simplest shading types (e.g. `flat`) it's just a case of choosing a colour, but the more complex ones have several associated parameters.

The various shading types and their usages are described in the following subsections.

- 8.4.1 `auto`
- 8.4.2 `flat`
- 8.4.3 `translucent`
- 8.4.4 `transparent`
- 8.4.5 `density`
- 8.4.6 `aux`
- 8.4.7 `weighted`
- 8.4.8 `paux`
- 8.4.9 `pweighted`

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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk