W=1000.0
F=sqrt(30.0*W)
T=sprintf('%d Watt',W)
ym=F/28.0+2.0
set y2range [0:ym]
set xrange [.1:10000]
set yrange [0:100]
set logscale x
set xlabel 'f/MHz'
set ylabel 'E / V/m' tc rgb 'blue'
set y2label 'r/m' tc rgb 'green'
set y2tics 2
set ytics nomirror
plot 0 title T
replot [ .1 : 1] 87.0 title '' lt rgb 'blue' axis x1y1
replot [ 1 : 10] 87.0/sqrt(x) title '' lt rgb 'blue' axis x1y1
replot [ 10 : 400] 28.0 title '' lt rgb 'blue' axis x1y1
replot [ 400 : 2000] 1.375*sqrt(x) title '' lt rgb 'blue' axis x1y1
replot [2000 :10000] 61.0 title '' lt rgb 'blue' axis x1y1
replot [ .1 : 1] F/87.0 title '' lt rgb 'green' axis x1y2
replot [ 1 : 10] F*sqrt(x)/(87.0) title '' lt rgb 'green' axis x1y2
replot [ 10 : 400] F/28.0 title '' lt rgb 'green' axis x1y2
replot [ 400 : 2000] F/(1.375*sqrt(x)) title '' lt rgb 'green' axis x1y2
replot [2000 :10000] F/61.0 title '' lt rgb 'green' axis x1y2
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