Fits of the SB profile from the Ks wide field image to test potential sources of systematic errors. a) Subtraction of a potential sky offset. b) Assumption of constant extinction across the field. c) Subtraction of point sources down to Ks = 16 (blue), Ks = 18 (red), and all detectable point sources (black). d) No masking of dark clouds, or of systematic positive or negative residuals. e) Binning with a constant number of pixels (1 × 104) per bin. f) Logarithmic binning, leading to a higher weight of the inner bins.
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