Fig. 6.

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Background response, ΔB, as a function of air mass. One example skydip for the best ∼42% of the pixels, selected by a Chi-squared test. Black dots: binned signal. Red/blue dashed line: skydip fit distinguished per array. The signal is negative because the tuning is at high air mass (am = 2) and the background signal diminishes at lower am.
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