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from pylab import subplot, sin, pi, arange, setp, show ax = subplot(111) t = arange(0.0,3.0,0.01) s = sin(2*pi*t) c = sin(4*pi*t) p = ax.fill(t,s,'b',t,c,'g') setp(p, alpha=0.2) ax.vlines( [1.5], -1.0, 1.0 ) show()