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#### A.4.5.18 Fill Form

If a two-dimensional dataset represents a single-valued function, the Fill form () will fill the area underneath the function's curve with a solid colour. Parts of the surface which would only be partially covered (because of rapid function variation within the width of a single pixel) are represented using appropriate alpha-blending. The filled area may alternatively be that above the curve or (in some plot types) to its left or right.

One example of its use is to reconstruct the appearance of a histogram plot from a set of histogram bins. For X,Y data which is not single-valued, the result may not be very useful.

This form may be used in the Plane or Time plot windows.

Example Fill plot

Fill form configuration panel

The configuration options are:

Transparency
  Adjusts the transparency of the filled area.
Horizontal
  Determines whether the filling is vertical (suitable for functions of the horizontal variable) or horizontal (suitable for functions of the vertical variable). In the Time plot, the fill is always vertical, so this option is not provided.
Positive
  Determines the directional sense of the filling. If false, the fill is between the data points and negative infinity along the relevant axis (e.g. down from the data points to the bottom of the plot). If true, the fill is in the other direction.

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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