Location of the best fit and 1σ error bars in the age–metallicity plane for the UDG and the GC stack. The result of the study by van Dokkum et al. (2018c) is shown in black. The location of the median age and metallicity of the GC bootstrap sample is shown in orange. The orange error bar is both a measure of the error of the fit and an estimate of the physical parameter spread intrinsic to the GC sample.
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