A horizontal bar chart displays the average grade achieved for a list of university module codes, sorted by grading scale. The visualization emphasizes the distribution of marks across many modules, using a color gradient from steelblue to grey to represent low to high scores. Built with D3 v5, it uses `scaleLinear` for the x-axis and color scale, `scaleBand` for y-axis categories, and `axisBottom` with custom tick formatting. SVG rectangles render the bars with `transition` animation over a duration of 1000ms, transitioning their width and fill. The data is loaded from a CSV file via `csv` and parsed for numeric marks.