Top: fit of the SCUBA-2 MAMMOTH-1 true differential number counts at 850 μm using the functions given in literature works for blank fields (Chen et al. 2013b; Casey et al. 2013; Zavala et al. 2017; Geach et al. 2017) with N0 free to vary. Bottom: SCUBA-2 MAMMOTH-1 true cumulative number counts at 850 μm compared to the fit models obtained in the top panel. In both panels, the blue dot-dashed curve is our true number counts curve from Table 4. All the literature models need a significant increase of their normalization parameter N0 to fit our data at 850 μm, revealing that the covered effective area is overdense with respect to blank fields. We list the values in Table 6.
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