Fig. 7.
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Top view of the Planck focal plane. The central array contains the HFI feed-horns, cooled to 4 K, feeding bolometric detectors cooled to 0.1 K. The LFI horns in the outer part of the array are labeled with numbers; they are cooled to 20 K. The LFI horn numbers 18−23, 24−26, and 27−28 correspond to the 70 GHz, 44 GHz, and 30 GHz channels, respectively.
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