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Fig. 1

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Upper panel: the ωb parameter is scanned (keeping all other parameters fixed to their best-fit values) and the Planck χ2 values are shown on the vertical axis. Blue points are obtained with the class default settings, and red ones with our high-precision ones. A smooth parabola is fit and shown in black. Lower panel: residuals with respect to the parabola. The rms of this noise is improved from 0.02 for the default settings to 0.005 for the high-precision ones.

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