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(a) Hb–CO data at high intensity detected at the 0-1 transition frequency (solid curve) and the corresponding third order calculation which includes both the main absorption band and the blueshifted substate band. The data are accurately reproduced by the strictly third order calculation. (b) The same third order calculation without the inclusion of the blueshifted substate band. The lack of beats demonstrates that the ADB mechanism is responsible for the beats.
