extent

Specify range of surrounding spectra, which is used to detect spikes. Use MatLab vector creation notation, for example, if you want to use 3 spectra from the left and 2 spectra from the right, use -3:2, for spectra -5, -3, -2, 1, 2, 3 use [-5, -3, -2, 1:3]. If you want to use all the other spectra in the data set, use 0. Edge cases will be cropped, so be sure that there are at least 2 surrounding spectra used for each spectrum.