spread(x, ...)wl_expanse(x, ...)
expanse(x, ...)
# S3 method for default
expanse(x, ...)
# S3 method for numeric
expanse(x, ...)
# S3 method for waveband
expanse(x, ...)
# S3 method for generic_spct
expanse(x, ...)
# S3 method for generic_mspct
expanse(x, ..., idx = "spct.idx")