...data

Since only one image is available for 3 of the nights, the corresponding points do not have any error bars at this stage, but will have one in the next one. This explains why the ideal Gaussian distribution of Fig. 23a (dashed line) is slightly shifted towards the left with respect to those in Fig. 23b and Fig. 24b.

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...patch

The values of this dispersion $\sigma^\prime_n$fluctuate around 4% from patch to patch.

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