Spectral view - adding bands obtained by band math

Hi, everyone,
I would like to create a spectral view to display the spectral curve of the original surface reflectance and the spectral indices (as shown in the figure below). However, in the spectral view, I cannot choose the obtained spectral indices. Only the original reflectance bands are available.

I wonder whether it is feasible in SNAP or not. Thanks very much for any advice.

You need to assign a wavelength to the indices, otherwise they are not available for the spectrum view.
Right-click on the band and select properties. In the dialog you can change the wavelength.

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Thanks very much. It works very well!