dofile("definitions.Quanty")
G.Print({{"file","Spectra.dat"}})
gnuplotScript = gnuplotHead .. [[
set output "Spectra.ps"
plot "Spectra.dat"  using 1:(-$3  ) title 'T1' with lines ls  1,\
     "Spectra.dat"  using 1:(-$5+4) title 'T2' with lines ls  2,\
     "Spectra.dat"  using 1:(-$7+8) title 'T3' with lines ls  3
]]
file = io.open("Spectra.gnuplot", "w")
file:write(gnuplotScript)
file:close()
-- call gnuplot to execute the script
os.execute("gnuplot Spectra.gnuplot")
os.execute("convert -density 1024 Spectra.ps -resize 1024 Spectra.png")