four_days_1min.data     Ground level irradiance for wavelength bands
gap.mspct               Solar spectral irradiance in a tree canopy gap
                        (measured)
irrad_Kipp.data         Ground level solar irradiance (measured)
photobiologySun-package
                        photobiologySun: Data for Sunlight Spectra
ppfd_BF.data            Ground level solar PAR photon irradiance,
                        direct and diffuse (measured)
ppfd_LICOR.data         Ground level solar PAR photon irradiance
                        (measured)
sun_elevation.spct      Ground level spectral irradiance and sun
                        elevation
sun_hourly_august.spct
                        Ground level spectral irradiance at hourly
                        intervals
sun_hourly_june.spct    Ground level spectral irradiance at hourly
                        intervals
sun_hourly_ozone.spct   Ground level spectral irradiance at hourly
                        intervals
sun_may_morning.spct    Ground level solar spectral irradiance
                        (measured)
sun_reference.mspct     Reference solar spectra from ASTM G173
