A horizontal bar chart displays letter frequencies from a tab-separated `bars.tsv` file, with letters A through Z on the x-axis and their proportional frequencies on the y-axis. The visualization uses Plotly.js via JSPM’s package manager, importing `plotly.js/dist/plotly` and loading data with `plotly.d3.tsv`. The code maps the TSV rows to arrays for letters and frequencies, then renders the bar chart with `plotly.newPlot` into a `<div id="chart">`. The example demonstrates Plotly’s integration with JSPM for browser-based module loading.