HFI channel integration time distribution function. For each HFI channel, the histogram of the integration time t per pixel of area (1.7′)2 is shown. The black curve is for the nominal all-sky (fsky = 1) mission. The red curve represents the masked sky, using the CL39 (fsky = 0.48 for the Galactic part) mask defined in Planck Collaboration XV (2014). The normalization is such that ∫df = fsky. The median integration time is about 0.42 s whereas the mean is 0.56 s. Notice that about 0.5% of the pixels are observed for more than 5 s; these mostly lie around the Ecliptic poles.
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