Flux-flux relations for which MA11 identified two distinct populations in a sample of field stars (shown as solid lines). Our sample of Class III stars is shown with the same plotting symbols as in Fig. 4 and is located on the upper relation. It extends this “active branch” to lower fluxes. Linear regressions and standard deviation for the Class III detections are shown as dash-dotted and dotted lines as in Fig. 10.
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