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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.