This is a demonstration of a spectrogram in das2. The canvas contains a plot with a SpectrogramRenderer, which gets dummy data from a RipplesDataSetDescriptor. Try left-clicking on the plot to see a cross-hair digitizer, which looks up the Z-value from the loaded dataset. Note that digitizing a grey region indicates "fill." Note that you can control the axes just as you did in the Axis Demo. Try right-clicking on the spectrogram, and select the mouse module "vertical slice." Try right-clicking on the spectrogram, select "properties", then unfold the properties sheet to expose renderers>renderers[0]>rebinner. Select "Nearest Neighbor" and apply changes.