This example displays the relative frequencies of letters in the English language as a set of vertical bars, one per alphabet letter. The chart is generated with D3 version 3, using an ordinal scale with `rangeRoundBands` to position bars and a linear scale to map value to height. Data is loaded from a tab-separated file via `d3.tsv` and rendered as SVG rectangles with white value labels. The design uses a fixed steelblue fill for all bars, creating a simple, unadorned visualization.