Three line charts show temperature and accelerometer readings (a_x, a_y, a_z) collected from a smartphone sensor over a single week, with temperature plotted on the x-axis and each accelerometer axis on the y-axis. The visualization uses D3 v6 to scale and axis the data, then draws the series using `d3.line()` with blue, red, and green strokes. Sensor data comes from a CSV file, and the temperature values are normalized from raw integers via a formula in the code.