import matplotlib.pyplot as plt import numpy as np y1, x1 = np.loadtxt('a.txt', delimiter=' ', unpack=True) y2, x2 = np.loadtxt('b.txt', delimiter=' ', unpack=True) y3, x3 = np.loadtxt('c.txt', delimiter=' ', unpack=True) y4, x4 = np.loadtxt('d.txt', delimiter=' ', unpack=True) plt.xlim([0, 11.1]) plt.ylim([0, 1.00001]) plt.plot(x1,y1, label='Web Server',linewidth=3.0) plt.plot(x2,y2, label='Cache Follower',linewidth=3.0) plt.plot(x3,y3, label='Web Search',linewidth=3.0) plt.plot(x4,y4, label='Data Mining',linewidth=3.0) plt.xticks(fontsize=14) plt.xticks(np.arange(1, 11, 1)) plt.yticks(fontsize=14) plt.xlabel('FCT (RTT)',fontsize=14, fontweight='bold') plt.ylabel('CDF',fontsize=14, fontweight='bold') plt.legend(fontsize=14) plt.grid() plt.show()