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This visualization shows the population of eight countries as horizontal bars, sorted by country name, with a title indicating "Top 10 most Populous Country" though only eight are plotted. The code uses D3 v7 APIs including `csv`, `scaleLinear`, `scaleBand`, `axisLeft`, `axisBottom`, and `format` to load data from `data.csv`, scale population values, and render axes and rectangles in an SVG. Bars are colored individually from a fixed palette, and population values are multiplied by 1000 after parsing, with tick labels formatted in billions using the `format(".3s")` method.