2018.1

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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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Color: Enter a color for the value axis. The color value must be a valid hexademical
color (HTML Hex Color) or a predefined CSS color (CSS color names). (Equivalent
to the axisColor property; see: axisColor.)
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Opacity: Enter the opacity in percentage for the axis. 100 is fully opaque, 0 is
transparent. Set opacity to 0 to hide the axis. (Equivalent to the axisAlpha
property; see: axisAlpha.)
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Thickness: Enter the thickness of the axis. (Equivalent to the axisThickness
property; see: axisThickness.)
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