A picture of the white Spectralon calibration reference panel along with other colored panels used for calibration check readings is shown below. Each panel is approximately 12 inches (30 cm) square. The calibration and check readings are made at a 45 degree sunangle and the radiometer is held perpendicular to the cards at about 10 inches (25 cm) above them. From left to right, top to bottom they are:

Typical spectral readings (45 degree sunangle) from the cards are:

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