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COLOR FIGURE 3.23 The WRR is determined by a group of absolute cavity radiometers named the World Standard Group. At the moment, the WSG is composed of six instruments: PMO-2, PMO-5, CROM-2L, PACRAD-III, TMI-67814, and HF-18748.

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COLOR FIGURE 5.3 Picture of a copper-constantan thermopile manufactured by Eppley Laboratory, Inc. Constantan wire is wrapped around a solid core and then dipped into a cop¬per bath. (Photograph by Warren Gretz, NREL staff photographer.)

COLOR FIGURE 5.4 Picture of Kipp & Zonen CM 22 pyranometers in ventilators at ...

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