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Gnuplot script:

# data source: http://www.temis.nl/uvradiation/info/uvindex.html
# solar spectrum: in Netherlands, noon, clear blue sky

action(l) = (l<297) ? 1 : ((l<327) ? 0.0015**((l-297)/30) : 1.5e-3*(1.2e-4/1.5e-3)**((l-327)/73))

set xlabel 'Wavelength (nm)'
set ylabel 'Irradiance (W/m^2/nm)'

set xrange [280:390]
set yrange [8e-5:2]
set log y
set grid
set style data lines
set nokey
set label 'Sunlight spectrum' at 330,0.3
set label "Erythemal action\nspectrum" at 320,0.025
set label 'Effective spectrum' at 300,2.5e-4

set terminal svg enhanced fsize 18
set output 'erythemal_spectrum.svg'

plot \
 'sunNL.dat', \
  action(x), \
  'sunNL.dat' using 1:(action($1)*$2)

unset output

Datafile sunNL.dat:

295 1e-4
300 3e-3
305 3.1e-2
310 0.1
315 0.2
320 0.3
325 0.42
330 0.48
340 0.55
350 0.60
365 0.65

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	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

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• 2006-07-10 22:30 Hankwang 600×480× (8848 bytes) Reference: http://www.temis.nl/uvradiation/info/uvindex.html