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[[underlined]]K5 Harvard:[[/underlined]] CaII (H and K) and Ca I 4227 most conspicuous;
G band not continuous; FeI 4383 and 4405 prominent
Stockholm: criteria as above 
Mt.W.: criteria as above
Victoria: comp. with stand. seq. 

M [[underlined]] Harvard [[/underlined]]: Bands of TiO increase throughout types Ma, Mb, Mc;
CaI I 4227 increases in width; fainter lines disappear in Mc; spectrum faint in violet
[[underlined]]Stockholm:[[/underlined]] Bands of TiO increasing 
Mt. W: Bands TiO inc.; Cal I 4227 increasing in width
Victoria: Bands TiO, increasing. 
[[underlined]]Dwarf K5, K6, M Harvard[[/underlined]] notes in Draper Cat. refer to strength of Ca4227 and 4455
[[underlined]]Stockholm:[[/underlined]] 4227 increases in width and become more asymmetrical. 
Mt.W. - width and int. of CaI 4227;
CaI 4434, 4454 and TiI 4535. Sub-class K6 for dwarfs but not giants.