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Both the Display and Coplot options in the Iris menu bar allow you to select a previously read spectrogram from the tool's memory buffer for simultaneous display with the current spectrogram in the main plot area (or in a separate, secondary window). Refer to the Iris How-to thread Visualizing SED Data in Iris for further information on the coplotting feature.

Note: The coplotting process does not involve combining, coadding, or splicing the spectral data in memory in any way; the raw data from the multiple input spectrograms is completely preserved in the resulting combination. This means that the aggregate SED may appear disjointed at a spectral coordinate location where two segments or photometric points from different sources coincide; i.e., there will be a scatter in the flux (y-axis) value for a particular spectral coordinate (x-axis) value, as shown in the image below.

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