axes_2 = pl.subplot(G[1, :-1])
axes_2.plot(X, F3)
axes_3 = pl.subplot(G[1:, -1])
axes_3.plot([1,2,3,4], [1,10,100,1000], 'b-')
axes_4 = pl.subplot(G[-1, 0])
axes_4.plot([1,2,3,4], [47, 11, 42, 60], 'r-')
axes_5 = pl.subplot(G[-1, -2])
axes_5.plot([1,2,3,4], [7, 5, 4, 3.8])
pl.tight_layout()
pl.show()