Method to compute the "parallel" standard error of the mean across members of a collection of spectra or of a spectral object containing multiple spectra in long form.
s_se(x, na.rm, ...)# S3 method for default
s_se(x, na.rm = FALSE, ...)
# S3 method for generic_spct
s_se(x, na.rm = FALSE, ...)
# S3 method for source_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for response_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for filter_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for reflector_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for calibration_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for cps_mspct
s_se(x, na.rm = FALSE, ...)
# S3 method for raw_mspct
s_se(x, na.rm = FALSE, ...)
If x is a collection spectral of objects, such as a
"filter_mspct" object, the returned object is of same class as the
  members of the collection, such as "filter_spct", containing the
  summary spectrum, with variables with names tagged for summaries other
  than mean or median.
An R object. Currently this package defines methods for collections of spectral objects.
logical. A value indicating whether NA values should be stripped before the computation proceeds.
Further arguments passed to or from other methods.
s_se(default):
s_se(generic_spct):
s_se(source_mspct):
s_se(response_mspct):
s_se(filter_mspct):
s_se(reflector_mspct):
s_se(calibration_mspct):
s_se(cps_mspct):
s_se(raw_mspct):
Method specializations compute the standard error of the mean at
  each wavelength across a group of spectra stored in an object of one of the
  classes defined in package 'photobiology'. Omission of NAs is done
  separately at each wavelength. Interpolation is not applied, so all spectra
  in x must share the same set of wavelengths. An error is triggered
  if this condition is nor fulfilled.