Legend
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switch: Whether to display bootstrap legend when the display type is circle
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Legend title
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text: Name of legend title.
font-size: Svg text attribute.
fill: Svg text attribute.
font-weight: Svg text attribute.
font-anchor: Svg text attribute.
font-style: Svg text attribute.
Symbol
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spacing: Spacing of two adjacent symbols.
size: Size of symbols.
fill-opacity : Svg path attribute.
stroke-width: Svg path attribute.
stroke-opacity: Svg path attribute.