This type is implemented by FacetChartSettingsFacetStyle, FacetChartSettingsSeriesColumnsStyle, FacetChartSettingsSeriesLinesStyle, LinearChartSettingsSeriesCandleStickStyle, LinearChartSettingsSeriesColumnsStyle, LinearChartSettingsSeriesLinesStyle and TimeChartSettingsSeriesLinesStyle.
Fill gradient. Allows building a gradient fill, bound to values. Contains array of value-color pairs. For example: [[-20, 'rgba(0,0,255,0.4)'],[30,'rgba(255,0,0,0.7)']]. If specified fillGradientMode: "horizontal" or "vertical", then value denotes fraction of the column width and must be in interval from 0 to 1 - this feature is available for columns only For example: [[0,"black"],[0.5,"red"],[1, "orange"]].
Fill gradient orientation for manual fill gradient mode. In use with fillGradient property. "null" for default fillGradient mode, "vertical" for vertical gradient, "horizontal" for horizonal rendering"
Specifies the URL to the image that will be used as the repeated fill pattern for the series.
fillPattern is specified,
fillGradient is ignored. If
fillColor is specified together with
fillPattern, it will be
used as the background color for the pattern.
Style settings for the legend item that is rendered for the series.
Configures the marker that is shown in the legend. Note that the default (
shape: null) means that instead of the
plain marker, an icon representing the series visual style will be used.
Array of line dash pattern to have a dashed line. The array contains length of dash followed by length of space in pixels. A sequence of multiple dash-space values is supported. In case you want to set a solid line, pass empty array: 
Start offset of line dash, in pixels
Width of the line.
Shadow color of column. If undefined, no shadow will be applied. Leave empty to use default shadow or set your own shadow color.
Shadow direction, x component.
Shadow direction, y component.