如何在使用python的matplotlib fill_between时更改轴

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [0, 3, 6, 9, 12]
ax.plot(x, y1, label='Line 1')
ax.plot(x, y2, label='Line 2')

ax.fill_between(x, y1, y2, color='gray', alpha=0.3)

ax.set_xlabel('X轴')
ax.set_ylabel('Y轴')
ax.set_xlim(0, 6)
ax.set_ylim(0, 30)
ax.set_xticks([1, 2, 3, 4, 5])
ax.set_yticks([0, 10, 20, 30])

ax.legend()
plt.show()