Fig. 6

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Panel a: CMD of NGC 2158 corrected for differential reddening, shown as mF606W versus mF606W − mF814W. Panel b: zoom-in of the low MS, corresponding to the grey rectangle in panel a. The straight red line marks the linear fit to the MS segment in the range 23.5 < mF606W < 24.75. Panel c: CMD rotated such that this reference line becomes vertical. The arrows indicate the M-dwarf discontinuity.
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