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Figure 3. ALMA 343 GHz image of Callisto at 0.16” resolution with mean disk emission subtracted. Right: ALMA contours plus the albedo map from Voyager and Galileo imaging (Camarca et al. 2023). A few crater impact regions are indicated, showing higher albedo and cooler mm thermal emission.
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The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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