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Fig. A.1


Color profile of the SDSS gi map used for the dust correction. The best-fitting linear line obtained by a robust fit is shown in green. We decided the red line to be the threshold in order to assure the same width of the gradient under the line-fit and above. All pixels above the red line and for log (d) < 1.9 ( ≈ 80) [arcsec] were corrected for extinction.

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