Grouped bar chart v4
This example presents a grouped bar chart with ten categorical groups along the x-axis and five colored series per group, using randomly generated data. The SVG visualization uses D3 v4’s `d3.scaleBand` for both the outer group positions and inner bars, with `d3.scaleLinear` mapping values from 0 to 1 to the vertical axis. Each series is assigned a distinct color via `d3.scaleOrdinal`, and the bars are rendered as nested `<g>` elements with `rect` shapes. The code includes axes with hidden x-axis path, and the layout is fixed at 960 by 500 pixels with defined margins.
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forked from <a href='http://bl.ocks.org/romsson/'>romsson</a>'s block: <a href='http://bl.ocks.org/romsson/2f94c1913b81f7fd20c530236934433a'>Grouped bar chart v4</a>