code_exoplanetes_a_corriger
A scatterplot maps exoplanet semi-major axis against host star mass, with each circle’s radius scaled to planet mass and color indicating discovery method. The SVG renders using d3.v4’s `d3.scaleLinear`, `d3.axisBottom`, `d3.axisLeft`, and `d3.scaleOrdinal` with `d3.schemeCategory10`. Data loads via `d3.text` and `d3.dsvFormat` from a semicolon-delimited CSV, with a legend built by appending `rect` and `text` elements.