Fig. 16
Filling factor as a function of color B–V (top left panel), stellar radii (top right panel), 
(bottom left panel) and rotation period (bottom right panel). Early M stars refer to M0 to M3 stars, mid M stars are M3.5 to M6 stars. Empty symbols show stars where the parameters where estimated instead of directly determined. The Sun value is included as a reference point.
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