This function gives a set of numeric multipliers that can be used as a weight to calculate effective doses and irradiances. The BSWF is normalized at 280 nm.
numeric array of w.length (nm)
a numeric array of the same length as
w.length with values for the BSWF normalized
as in the original source. The returned values are based on quantum effectiveness units.
In the original publication  describing the formulation, the long-end wavelength boundary is specified as 313.3 nm. The equation is coded here with no such limit so that any limit can be set when defining the waveband. We do so because in some cases it is of interest to vary this limit in sensitivity analyses. The effect on the RAF and doses of changing this boundary is substantial, and has been analysed by Micheletti et al. .
 Caldwell, M. M. (1971) Solar UV irradiation and the growth and development of higher plants. In Giese, A. C. (Ed.) Photophysiology, Academic Press, 1971, 6, 131-177
 Green, A. E. S.; Sawada, T. & Shettle, E. P. (1974) The middle ultraviolet reaching the ground Photochemistry and Photobiology, 1974, 19, 251-259
 Micheletti, M. I.; Piacentini, R. D. & Madronich, S. (2003) Sensitivity of Biologically Active UV Radiation to Stratospheric Ozone Changes: Effects of Action Spectrum Shape and Wavelength Range Photochemistry and Photobiology, 78, 456-461