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Fig. A.1.


Data reduction pipeline. Left two panels: each panel shows the raw spectra for the 5 min ON- or OFF-target positions (upper and lower panel respectively). The x-axis is the observed frequency and the y-axis shows the sampling time of the spectra, with a sampling rate of once every 1.006632926 s (0.993411 Hz). The signal intensity in individual spectra (300 of them in each panel) is represented by colours, with the scale illustrated by the colour bar on the right side of each panel. We note that those spectra in red stripes were sampled when calibration noise was on, and those in blue stripes were sampled when the calibration noise was off (see text). The units of the colour bar are digital number/1012 from ADU, which needs to be calibrated into temperature units. Middle left panels: we split the raw spectra into four cases: ON/OFF the target with calibration noise on/off. Middle right panel: average spectra of the four classes. We show the total background in blue colour, and the background from the first and remaining 74 s (green and purple, respectively) in the lower two panels. The green line shows a lower temperature than the purple line, implying an increasing system temperature. Right panel: spectra ON and OFF the target.

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