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(1, 3 and 4) 30°. (2) 40°. CS = coronary sinus; LAO = left anterior oblique; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein (LSPV); RAO = right anterior oblique; RIPV = right inferior pulmonary vein; RSVP = right superior pulmonary vein.
