This fork of a line chart visualizes daily surface air temperature data from 1940 onward, colored by year using the d3 interpolatePlasma color scale. The chart plots each year as a separate line, with 2024 highlighted in thick red for emphasis, while a semi-transparent inner rectangle provides background contrast. The code uses d3’s scaleLinear, extent, line, and flatGroup to prepare and render the multiple series, alongside the responsive-axes library for labeled axes and the observeResize utility for container dimensions.