Spectrum

spectrum.spectrl2(apparent_zenith, aoi, ...)	Estimate spectral irradiance using the Bird Simple Spectral Model (SPECTRL2).
spectrum.get_example_spectral_response([...])	Generate a generic smooth spectral response (SR) for tests and experiments.
spectrum.get_am15g([wavelength])	Read the ASTM G173-03 AM1.5 global spectrum on a 37-degree tilted surface, optionally interpolated to the specified wavelength(s).
spectrum.calc_spectral_mismatch_field(sr, e_sun)	Calculate spectral mismatch between a test device and broadband reference device under specified solar spectral irradiance conditions.

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