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(Color online) Example spectrograms of SMR stimuli with 33.33 (A),(B) and 100 (C),(D) carrier densities at 4 (A),(C) and 16 (B),(D) RPO. Grayscale mapping is according to the relative level in dB. Note that these stimuli are shown without onset and offset ramps. A discrete fast Fourier transform frequency resolution of 50 Hz was used.
