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Second Harmonic Generation

gnuplot> set xrange [-180:180]
gnuplot> set yrange [-180:180]
gnuplot> set pm3d
gnuplot> set hidden3d 
gnuplot> set title 'SHG'
gnuplot> splot sin(cos(x*pi/180))*sin(cos(x*pi/180))/(cos(x*pi/180)*cos(x*pi/180))*sin(cos(y*pi/180))*sin(cos(y*pi/180))/(cos(y*pi/180)*cos(y*pi/180)) title 'N=1

'

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