axes_3 = pl.subplot(G[1:, -1])
pl.xticks(())
pl.yticks(())
pl.text(0.5, 0.5, 'Axes 3', ha='center', va='center', size=24, alpha=.5)
axes_4 = pl.subplot(G[-1, 0])
pl.xticks(())
pl.yticks(())
pl.text(0.5, 0.5, 'Axes 4', ha='center', va='center', size=24, alpha=.5)
axes_5 = pl.subplot(G[-1, -2])
pl.xticks(())
pl.yticks(())
pl.text(0.5, 0.5, 'Axes 5', ha='center', va='center', size=24, alpha=.5)
pl.tight_layout()
pl.show()