2018.1

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Color: Enter a custom color for the label (default is black). The color value must be
a valid hexademical color (HTML Hex Color) or a predefined CSS color (CSS color
names). (Equivalent to the titleColor property; see: titleColor.)
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Font Size: Enter a font size for the title. (Equivalent to the titleFontSize
property; see: titleFontSize.)
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Grid group:
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Color: Enter a color for the grid lines that divide the category axis. The color value
must be a valid hexademical color (HTML Hex Color) or a predefined CSS color
(CSS color names). (Equivalent to the gridColor property; see: gridColor.)
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Opacity: Enter the opacity percentage of the grid. Default is 15%. 100 is fully
opaque, 0 is transparent. (Equivalent to the gridAlpha property; see: gridAlpha.)
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Thickness: Enter a thickness for the grid lines. Default is 1. (Equivalent to the
gridThickness property; see: gridThickness.)
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Position: Specifies if a grid line is placed on the centre of a cell or on the beginning
of a cell. (Equivalent to the gridPosition property; see: gridPosition.)
Tip
The position of the ticks (which is Middle by default) does not move with the
grid. To change the tick position, add the following to the categoryAxis
section on the Source tab: "tickPosition": "start".
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Tick Length: Length of the tick marks. (Equivalent to the tickLength property;
see: tickLength.)
Tip
By default, one label per grid line will appear on the Category axis. To change
that frequency, add the following to the categoryAxis section on the
Source tab: "labelFrequency": "2" (replace 2 by the desired number
of grid lines).
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Axis group:
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