Amplitude spectral window corresponding to various sampling. By definition, the peak at ν = 0 d⁻¹ is always going up to the value 1. The upper panel corresponds to some 8000 data points and illustrates the sampling that Gaia would generate if the sole effect would correspond to the spinning of the satellite on itself. The three other panels represent typical spectral windows corresponding to objects at various positions in the sky. The number of data points are, from the second panel to the bottom one, respectively, 26, 19 and 14. The right panels are zooming on the low frequency domain. All the individual peaks have by definition the same shape and the same width. They are not resolved in this figure.