Abundance of UDGs as a function of halo mass. Thick black points: averages in bins of halo mass. Two types of error are shown: thick errors with hats are Poisson uncertainties, while thin errors show bootstrap errors after resampling the groups in each bin. Thick red points: values measured for eight individual clusters in vdB16. Black lines: best-fitting power-law relation including all data points shown here. Dashes: relations corresponding to the ±1σ uncertainties on the power-law index. The numbers on the top axis indicate the number of groups in each bin.
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