Thermogram of a couple sleeping in bed. The different colours represent different temperatures. The lightest colours are the hottest temperatures, while the darker colours represent cooler temperatures. Thermography uses special cameras that can detect light in the far-infrared range of the electromagnetic spectrum (900-14,000 nanometers or 0.9-14 micrometres) to create an image that represents an objects temperature. This image is part of a series.
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