The analysis of the LED spectra also involves several steps. First, an
energy calibration is done based on the expected position of the muon peak.
Next, the five or six discrete energy peaks are fit with a Gaussian function
to determine
their means and standard deviations. Finally, the
slope of the graph of sigma squared against energy is measured and the number of
photoelectrons per MeV (
) is extracted, as described in
Section 3.1.