This interactive line chart displays the daily average air temperature in Belgium for the year 2021. Data is loaded from a CSV file using the `csv` function from D3 v7, then sorted by date. The visualization is built with React, rendering an SVG that uses `scaleTime` and `scaleLinear` to map date and temperature values to coordinates. A single natural cubic spline path, created with `line` and `curveNatural`, shows the temperature trend, while axes are generated with tick marks from `xScale.ticks()` and `yScale.ticks()`.