Save this script to file "Variation-couple-uf" then run the command line "gnuplot couple_mas", you will get Variation-couple-uf.svg, if you have well installed gnuplot 4.0 or later.
set terminal svg
set encoding iso_8859_1
set border
set mxtics
set mytics
set grid xtics ytics
set xlabel "N(tr/min)"
set ylabel "C(Nm)"
set xrange [0:3400]
set yrange [0:32]
set output "Variation-couple-uf.svg"
cmax=30
gmax=0.11
fn=50
gm(x) = gmax*fn/x
g(x,fs) = 1 - x/(60*fs)
Tem(x,fs) = 2*cmax*1/(gm(fs)/g(x,fs)+g(x,fs)/gm(fs))
plot Tem(x,50) title "f=50Hz" with lines lw 2, \
Tem(x,40) title "f=40Hz" with lines lw 2, \
Tem(x,30) title "f=30Hz" with lines lw 2, \
Tem(x,20) title "f=20Hz" with lines lw 2, \
Tem(x,10) title "f=10Hz" with lines lw 2
== Summary == {{Information |Description= variation du couple/vitesse lors de la commande en U/F d'une machine asynchrone |Source=own work/travail personnel |Date=25/05/2007 |Author=Yves-Laurent Allaert |Permission={{self2|GFDL|cc-by-sa-2.5,2.0,1.0}} }}