smooth_spct(x, method, strength, ...)# S3 method for default
smooth_spct(x, method, strength, ...)
# S3 method for source_spct
smooth_spct(x, method = "custom", strength = 1, na.rm = FALSE, ...)
# S3 method for filter_spct
smooth_spct(x, method = "custom", strength = 1, na.rm = FALSE, ...)
# S3 method for reflector_spct
smooth_spct(x, method = "custom", strength = 1, na.rm = FALSE, ...)
# S3 method for response_spct
smooth_spct(x, method = "custom", strength = 1, na.rm = FALSE, ...)
# S3 method for generic_mspct
smooth_spct(x, method = "custom", strength = 1, na.rm = FALSE, ...)