Fig. 21

Measurements of misalignment between Band 1 and Band 2. Because of the Nasmyth folding mirror, a misalignment originating in the receiver rotates on the sky as a function of the elevation. While the azimuth (blue) and elevation (magenta) components of the on-sky misalignment are elevation-dependent, the magnitude (cyan) remains constant. Note the increased scatter at low elevation due to atmospheric seeing.
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