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1.0 MB (142.5 KB compressed)
690 x 519 pixels
5.8 x 4.3 cm ⏐ 2.3 x 1.7 in (300dpi)
T-SERVICE / SCIENCE PHOTO LIBRARY T-SERVICE / SCIENCE PHOTO LIBRARY
Porcupine, thermogram. A thermogram shows variation in temperature on the surface of an object, measured by the long-wave infrared radiation it emits. The temperature scale is colour-coded and runs from white (3.7 degrees Celsius, coldest) through yellow, orange, pink and purple to blue (warmest, 32 degrees Celsius).
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