plt.text(0.2, 0.8, "LArrow", ha='center', size=16,
         bbox=dict(boxstyle="larrow, pad=0.3, head_angle=150"))
plt.text(0.2, 0.2, "LArrow", ha='center', size=16,
         bbox=dict(boxstyle="larrow, pad=0.3, head_width=0.5"))
plt.text(0.5, 0.8, "DArrow", ha='center', size=16,
         bbox=dict(boxstyle="darrow, pad=0.3, head_width=3"))
plt.text(0.5, 0.2, "DArrow", ha='center', size=16,
         bbox=dict(boxstyle="darrow, pad=0.3, head_width=1, head_angle=60"))
plt.text(0.8, 0.8, "RArrow", ha='center', size=16,
         bbox=dict(boxstyle="rarrow, pad=0.3, head_angle=30"))
plt.text(0.8, 0.2, "RArrow", ha='center', size=16,
         bbox=dict(boxstyle="rarrow, pad=0.3, head_width=2, head_angle=-90"))
plt.axis("off")