帮我看一下代码

新手 就想画两组值，而且分别表示5CRS和10 CRS

hold on;
x=[5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20];
y1=[1.3 1.45 1.72 1.95 2.1 2.40 2.48 2.67 2.9 3.11 3.27 3.5 3.7 3.9 4.08 4.4];
y2=[1.4 1.5 1.74 2 2.12 2.42 2.56 2.79 3.11 3.2 3.41 3.61 3.82 3.97 4.20 4.7];
plot(x,y1,'*');
plot(x,y2,'+')
set(gca,'XTick',5:5:20)
set(gca,'YTick',0:0.5:5)
set(gca,'Fontsize',14)
xlabel('Number of Secondary Users','FontSize',14);
ylabel('Throughput(Mbps)');
box on;
legend('*','5CRS');
legend('+','10CRS')