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GUI for selecting spectral regions on a plot.
If input variable (x) is a vector SPECEDIT plots x (e.g. spectra) versus an optional input f e.g. wavelengths. If x is a matrix of spectra then SPECEDIT plots the mean of x where the rows of x correspond to different sample spectra and the columns of x correspond to different wavelengths. Regions of x can be selected using push buttons. The edited matrix input and column indices can be saved to the workspace interactively.