M4 ~

Temperature						Luminosity
Type	Class	Value	Temperature	Details		Type	Class	Details		Pecularities	Quality
Harvard	M	4	2900 K	Harvard spectral value is 4 with class Harvard spectral class M with effective temperature [2000, 3500] ; absorptions [Metals, TiO]				unknown luminosity			~

COBREX simplification = M4 ~

Temperature
Type	Class	Value	Temperature	Details		Quality
Harvard	M	4	2900 K	Harvard spectral value is 4 with class Harvard spectral class M with effective temperature [2000, 3500] ; absorptions [Metals, TiO]		~

Ref: An Encoding System to Represent Stellar Spectral Classes in Archival Databases and Catalogs Version 1.4