Fig. 2
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The averaged main-beam flat-field response for the CONCERTO arrays across 2021 and 2022 observation campaigns. Top: Averaged main-beam flat-field response for the CONCERTO low-frequency (left) and high-frequency (right) arrays during the 2021 (top) and 2022 (bottom) campaigns. Each valid LEKID is represented by an ellipse with a half width at half maximum diameter. The lower left corner of the arrays shows an optical distortion with eccentricity above 0.75 (highlighted in red). The flat fields are nearly identical between the two observation periods and their distribution follows the resonance frequencies of the LEKIDs. Bottom: Histograms of the averaged main-beam flat-field response for the CONCERTO low-frequency (left) and high-frequency (right) arrays.
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