Fig. 5

Upper panel: TSS (slope of the differential velocity shifts of spectral lines, in m/s/(F/Fc)) versus the B−V of the stars. The solid line indicates a linear fit while the red dots correspond to TSS averaged over bins in B−V. Lower panel: residual of the TSS after correction of the B−V dependence versus Log . The solid line is a linear fit to the TSS.
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