I can fill between curves using either:
xs, ys = poly_between(x, y1, y2)
ax = gca()
ax.fill(xs,ys, facecolor='b', alpha=0.5)
xs = concatenate((x,x[::-1]))
ys = concatenate((y1,y2[::-1]))
p = fill(xs,ys,facecolor='b', alpha=0.5)
But, if I try to do either on a semilogy plot, I get a strange looking
combination of reflected-looking polygons.
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