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