You can "turn on" or "turn off" up to nine preset infinite light sources on your chart. An infinite light source means that while there is a direction towards which the light shines, there is not a fixed distance from which the light is shone. The position of the light source is at infinity with reference to the chart. This allows a more uniform illumination and shading of the chart surfaces. At an intensity of 100 percent, chart surfaces perpendicular to the light source are fully illuminated. At an intensity of 50 percent, these surfaces receive 50 percent illumination from this light.

Important A chart surface's total illumination is the sum of the contributions of the ambient light and each of the infinite lights.