Fig. 2
CARMENES spectra of spectral region around He I IR line across M dwarf spectral sequence exhibiting considerable change from M0 to M8. Each normalised spectrum is offset by 0.2 in flux density for the purposes of clarity. The observed normalised spectrum is denoted in blue with its local pseudo-continuum/offset marked as a dashed grey horizontal line. Vertical grey dashed lines mark the position of the lines considered in the fit. The stars shown are M0.0 V: J03463+262/HD 23453; M0.5 V: J02222+478/BD+47 612; M1.0 V: J00051+457/GJ 2; M1.5 V: J02123+035/BD+02 348; M2.0 V: J01013+ 613/GJ 47; M2.5 V: J00389+306/Wolf 1056; M3.0 V: J02015+637/G 244-047; M3.5 V: J12479+097/Wolf 437; M4.0 V: J01339-176/LP 768-113; M4.5 V: J01125-169/YZ Cet; M5.5 V: J00067-075/GJ 1002; M6.0 V: J14321+081/LP 560-035; M7.0 V: J02530+168/Teegarden’s star; and M8.0 V: J19169+051S/vB10.
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