Nr=[1 3 4 5 6 7 8 9 10 12 16 24 32 48 65];
C=[0.99515 1.4868 2.063 2.2087 2.3663 2.5462 2.7415 2.9954 3.3765 3.6703 4.1317 4.3163 4.694 5.4925 5.8186];
plot(Nr,C,'-o');
axis([0,70,0,17]);
grid on;