{"version":"1.0","type":"rich","title":"Day / Hour Heatmap in v4","description":"This heatmap visualizes concurrent user sessions across days of the week and hours of the day, with cell color intensity encoding the session count. The SVG-based chart uses `d3.scaleQuantile` with a nine-color YlGnBu palette and includes a legend showing quantile thresholds. It reads TSV data via `d3.tsv`, renders labeled day and hour axes, and animates color transitions with `transition().duration(1000)` when switching between two datasets using the dataset picker buttons.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/gist-107ea281b84a78ab72596e3ca9faea00?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}