Derived β values for each redshift bin δ considering TCMB(z = 0) = 2.726. Red filled circles show our measurements, light- and dark-blue shaded regions show the 1 and 2σ levels. Errors bars are displayed centered on β = 0 to facilitate the comparison between uncertainties in the different redshift bins δ. The dashed black line represents β = 0 for standard evolution.
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