CODE POUR GNUPLOT

set samples 1000
set xrange[0:0.003]
set yrange[0:1.8]
set grid
set multiplot
w=2*pi*2000
m=2
B=sqrt(1-m**2)
C=m/B
f1(x)=1-(exp(-m*w*x))*(cos(w*B*x)+C*sin(w*B*x))
plot f1(x) with lines lt 3
w=2*pi*2000
m=0.99
B=sqrt(1-m**2)
C=m/B
f1(x)=1-(exp(-m*w*x))*(cos(w*B*x)+C*sin(w*B*x))
plot f1(x) with lines lt 1
w=2*pi*2000
m=0.5
B=sqrt(1-m**2)
C=m/B
f1(x)=1-(exp(-m*w*x))*(cos(w*B*x)+C*sin(w*B*x))
plot f1(x) with lines lt 5
w=2*pi*2000
m=0.15
B=sqrt(1-m**2)
C=m/B
f1(x)=1-(exp(-m*w*x))*(cos(w*B*x)+C*sin(w*B*x))
plot f1(x) with lines lt 2
unsetmultiplot