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Fig. 3

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Black: reddening law presented as as a function of wavelength. Filled circles correspond to the results obtained using the UBVRI-like bands, curves are for the spectral analysis. Red: linear slope sλ (mag/Å) of equivalent widths versus δMλ. Dotted lines: CCM law fit corresponding to the broad bands analysis. Panel a)δMλ corrected only for the phase dependence (Eq. (1a)). Panel b)δMλ corrected for phase and ewSi (Eq. (1b)). Panel c)δMλ corrected for phase, ewSi and ewCa (Eq. (1c)). The vertical dotted lines represent the UBVRI-like bands boundaries. The shaded vertical bands represent the Si and Ca domain. The shaded band around the curves are the statistical errors.

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