Fig. 1
Top panel: Ca iiλ8542 observations acquired at the line positions indicated on the line profile. Exposure time is 900 ms (circles) and 210 ms (crosses). Bottom panel: CRISP instrumental profile at 854.0 nm (solid gray) in logarithmic scale. A solar-atlas profile multiplied with the theoretical estimate of the prefilter (dashed-dotted line) is indicated in blue.
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