%Uppg 3a
hold off

for a=0:2:20
H=tf([3.6 1], [1 1.3*a 6.7])
step(H, 5)
grid on
hold on
end

legend('a=0','a=2','a=4','a=6','a=8','a=10','a=12','a=14','a=16','a=18', 'a=20')
