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#### A.4.5.31 Mark4 Form

The Mark4 form () is available from the Quad Position layer control, and plots 4 similar markers of fixed size and shape representing 4 separate positions from the same table row. This is a convenience (you could do the same thing by plotting the four markers separately) that makes it easy to mark the corners of polygons plotted from the Quad layer control.

Example Mark4 plot

Mark4 form configuration panel

Configuration options are the same as for Mark:

Shading Mode
  See Appendix A.4.6.
Shape
  Marker shape from a list of options.
Size
  Marker size in pixels.

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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