Specifies the orientation of the gradient if the gradient type is of the type 'linear'
vertical
vertical,
horizontal
Area,
AreaLine,
Bar,
BarLine,
Boxplot,
Circular,
Correlation,
DotLine,
Dotplot,
Fish,
Gantt,
Genome,
Heatmap,
Line,
Map,
Network,
ParallelCoordinates,
Pie,
Sankey,
Scatter2D,
Scatter3D,
ScatterBubble2D,
Stacked,
StackedLine,
StackedPercent,
StackedPercentLine,
TagCloud,
Tree,
Treemap,
Venn
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