Fig. 1
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Ratios of the observed to photospheric flux at 550 nm (R550) for each star (see colour legend) are shown as a function of the spectral type. When not visible, the errors are smaller than the size of the dots. Dotted and dashed grey lines represent R550thresholds of 1.0, 0.85 respectively. No relation between spectral type and R550is observed.
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