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Color tables define mappings between values and colors for the display of results. The number of colors, the range of values they correspond to and the treatment of values outside this range can be set.
The current color table is shown at the top of the window. Below that are sliders for the minimum and maximum values that these colors correspond to: points with value Cmin will be shown in the first color, those at Cmax in the last one, and those between are scaled linearly. Colors run from left to right, starting in the top left corner. Points above or below the range are either not drawn, or are drawn in the last and first colors, respectively, according to the checkboxes fillAbove and fillBelow. The number of colors used is set by Ncol.
To set a color, click on it with the left mouse button, and then choose "apply" in the ColorTargetEditor window. To fill a range of the table with a uniform color gradient, set each of the end points to the desired colors. Then click the start of the range with the left mouse button and click the end with the right mouse button.
The color table does its best not to lose information as you change its size: each time you set a color manually the present size of the table becomes the true resolution.