Fig. 1
Emission reversal in the Ca ii H line of GJ 674 (red line; M2.5V; Prot = 35 d), GJ 176 (green dots; M2V; Prot = 39 d), GJ 163 (black line; M3.5), and GJ 581 (blue dashes; M3V; Prot = 94 d), ordered from the most prominent to the least prominent peaks. GJ 163 displays a lower activity level, which is a strong indication of slow rotation.
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