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#### A.4.4.9 SkyGrid Layer Control

The SkyGrid layer control () is available from the Sky Plot Window, and plots an additional axis grid on the celestial sphere. This can be overlaid on the default sky axis grid so that axes for multiple sky coordinate systems are simultaneously visible.

Note that some of the configuration items for this plot layer, such as grid line antialiasing and the decimal/sexagesimal flag, are inherited from the values set for the main sky plot grid in the Sky Axes Control.

Sky plot with no data, but an additional Galactic sky axis grid plotted over the default equatorial grid.

This control has only one tab, Style, with the following fields:

Sky System
  Selects the sky system (Equatorial, Galactic, Supergalactic or Ecliptic) whose coordinates the plotted grid lines should represent. Note this is assessed relative to the View Sky System selected in the Sky Axes Control. If the value here is the same as the View Sky System (by default Equatorial) the grid used by this layer will be the same as the default axis grid.
Grid Color
  Selects the colour with which grid lines will be drawn.
Transparency
  Determines how transparent the grid lines will be.
Label Position
  Determines whether and how the numeric labels will be placed along the grid lines. Currently only two options, Internal and None.
Longitude Grid Crowding
  Use the slider to control how closely longitudinal grid lines (meridians) are packed.
Latitude Grid Crowding
  Use the slider to control how closely latitudinal grid lines (parallels) are packed.

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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