Main display of spectrogram GUI. (a) “Spectrogram display”: (A) display mode toggle and (B) channel selection and (b) “frequency band display”: (A) channel(s) selection, (B) scaling type, (C) scale for display, (D) frequency band, (E) night hypnogram, (F) mean power spectrum for a specific sleep stage, (G) selection of the hypnogram scorer, and (H) selection of another data file.
