This is a thin line that appears in the middle of the variables and / or samples in one dimensional graphs and multidimensional heatmaps just for aesthetics
string
false
false,
solid,
dotted,
dashed,
dotdash,
longdash,
twodash
Area,
AreaLine,
Bar,
Boxplot,
Correlation,
DotLine,
Dotplot,
Heatmap,
Line,
ParallelCoordinates,
Pie,
Sankey,
Stacked,
StackedLine,
StackedPercent,
StackedPercentLine,
TagCloud,
Tree,
Treemap
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