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Calibrating the sunphotometer family

The sunphotometer family running it's pre-ORACLES and pre-NAAMES calibration trip to some of the cleanest air in the world, on the top of a mountain in the middle of the Pacific: Mauna Loa. Featured here is 4STAR, 4STARB (our new instrument), 2STAR (ground based detector standard), and trusty old AATS.

Samuel LeBlanc
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