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## B.17 `plot2sphere`: Draws a sphere plot

`plot2sphere` draws plots in an isotropic 3-dimensional space using spherical polar coordinates. The plotting volume is a cube, which is viewed from the outside and usually bounded by a wire frame annotated by Cartesian coordinates. This viewing cube is not necessarily centered on the coordinate origin.

This plotting geometry is like that used by `plot2cube`, but the coordinate unit size is always the same in the three dimensions, and the coordinates are specified differently.

Positional coordinates are specified as `lon`, `lat`, `r` triples, e.g.:

       plot2sphere layer1=mark in1=survey.fits lon1=RA lat1=DEC r1=REDSHIFT

Content is added to the plot by specifying one or more plot layers using the `layerN` parameter. The `N` part is a suffix applied to all the parameters affecting a given layer; any suffix (including the empty string) may be used. Available layers for this plot type are: `mark`, `size`, `sizexy`, `link2`, `mark2`, `poly4`, `mark4`, `polygon`, `area`, `central`, `label`, `arealabel`, `line3d`, `contour`, `spheregrid`.

- B.17.1 Usage
- B.17.2 Examples

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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