...
c3=load(file-3.txt','-ascii');
c4=load('file-4.txt','-ascii');
hold on;
plot(c1(:,1),c1(:,2),'-k','LineWidth',4);
plot(c2(:,1),c2(:,2),'-k','LineWidth',4);
plot(c3(:,1),c3(:,2),'-k','LineWidth',4);
plot(c4(:,1),c4(:,2),'-k','LineWidth',4);
legend('c1','c2','c3','c4');
hold off;
...
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