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Selecting a Year on a Line Chart

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Kkbriggs1
Last edited Aug 26, 2019
Created on Aug 26, 2019

This visualization shows UN population estimates and projections from 1950 to 2100 for world regions as multi-line charts, with a movable vertical line that selects a year. Moving the mouse across the chart updates the selected year, which is rendered as a black vertical line. The chart uses D3 v5 with SVG rendering, employing `d3.line` with `curveBasis` for smooth paths, `d3.nest` to group data by region, and `d3.scaleTime` and `d3.scaleLinear` for axes. A custom color legend maps regions using `d3.scaleOrdinal` with `schemeCategory10`.

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