Fig. 9
A smoothed K-band magnitude distribution (dashed line) for region of size 17′ × 17′. The Sobel filter (solid black line) has been applied and a Gaussian curve (solid red line) has been fitted to the strongest peak to locate the TRGB magnitude and error. The TRGB lies at K0 = 17.41 ± 0.11 mag. The distribution is a generalised histogram and the vertical scale is arbitrary.
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