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Fig. 5

image

Standard deviation of velocity-binned residuals between a CCF and its best-fit model, as a function of the binning factor (black diamonds). A single pixel is 0.5 km s-1 wide. The best fit (black line) is a harmonic combination of an uncorrelated noise component, inversely proportional to the square root of the binning factor (blue line), and a constant correlated noise component (red line).

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