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#### A.4.5.38 StatMark Form

The StatMark form (), available from the XYArray Layer Control, plots a set of markers based on a combination (typically the mean) of input array-valued coordinates. The input X and Y coordinates must be fixed-length arrays of length N; N markers are plotted, each one representing the mean (or median, minimum, maximum, ...) of all the input array elements at the corresponding position.

Example StatMark plot

StatLine form configuration panel

The configuration options are:

X Combine
Y Combine
  Defines how corresponding array elements on the X/Y axis are combined together to produce the plotted value. The following options are currently available:
  - `mean`: the mean of the combined values
  - `median`: the median of the combined values (may be slow)
  - `min`: the minimum of all the combined values
  - `max`: the maximum of all the combined values
  - `q.01`: the 1st percentile of the combined values (may be slow)
  - `q1`: the first quartile of the combined values (may be slow)
  - `q3`: the third quartile of the combined values (may be slow)
  - `q.99`: the 99th percentile of the combined values (may be slow)
  - `stdev`: the sample standard deviation of the combined values
  - `sum`: the sum of all the combined values
  - `count`: the number of non-blank values
Color
  Color of the plotted markers.
Shape
  Shape of the plotted markers.
Size
  Size of the plotted markers 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