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(A) Spectral diffusion width of a hole after a cyclic temperature variation between 100 mK and 4 K as a function of waiting time. (B) Spectral diffusion width of a hole burnt immediately after the cyclic temperature variation between 100 mK and 4 K as a function of waiting time. The insert shows hole A before (I) and immediately after (II) the temperature cycle (arrows). Sample: protoporphyrin–IX-substituted myoglobin in a glycerol/water glass.
