Smoothed D3.js Radar Chart
This smoothed radar chart compares smartphone attributes—battery life, brand, contract cost, design, connectivity, screen size, price, and "smartphone" status—across three phone models using normalized values up to 0.5. The visualization employs D3.js to render seven concentric grid levels, radiating axes, and smoothed, glowing polygon areas with colored dots for each data series, plus animated transitions. Built with React and SVG, it uses D3’s `scale.ordinal` for color coding and `d3.scale.linear` for radius mapping, and includes a blur filter for the glow effect.