Autocorrelation of the HIFI noise (for the H beam; the figure for the V beam looks very similar) and of Gaussian noise for comparison. Clearly, adjacent pixels in the oversampled HIFI data used for fitting are correlated. Also shown is the autocorrelation of our synthetic noise, which well represents the correlation pattern observed in the data. The negative autocorrelation of the data is of random nature and due to the limited number of data points. The analysed HIFI noise comes from the data interval [−53,10]∪ [50, 100] km s-1, i.e. well outside the C ii line (Fig. 2).
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