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{{redirect|Sonograph|the musical recording|Sonograph (EP)}}
{{for|the scientific instrument|Optical spectrograph}}
[[Image:Spectrogram-19thC.png|thumb|400px|Spectrogram of the spoken words "nineteenth century". Frequencies are shown increasing up the vertical axis, and time on the horizontal axis. To the right shows that the color intensity increases with the density.]]
[[File:3D battery charger RF spectrum over time.jpg|thumb|400px|A 3D spectrogram: The RF spectrum of a battery charger is shown over time]]
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