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d3.svg.area.radial = function() {
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var area = d3_svg_area(d3_svg_lineRadial);
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area.radius = area.x, delete area.x;
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area.innerRadius = area.x0, delete area.x0;
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area.outerRadius = area.x1, delete area.x1;
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area.angle = area.y, delete area.y;
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area.startAngle = area.y0, delete area.y0;
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area.endAngle = area.y1, delete area.y1;