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Fig. 4

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Upper panel: f-parameters for all of the channels considered in this work and for several DM particle masses in the interval mDM = 5 − 100 GeV. For all of the cases, the asymptotic high-redshift f-parameter values have been renormalized to be equal to one. Lower panel: the same as above, after dividing with a “typical shape”, (fmax(z) + fmin(z))/2, of the f-parameter curve.

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