matplotlib中的对数图正在创建两行

Question

我想知道为什么我的loglog图仅创建我想要的橙色行时却创建两行，为什么标签不显示？任何见识将不胜感激。

import matplotlib.pyplot as plt
data1 = [(3, 5034), (2, 4596), (4, 1469), (5, 1209), (6, 540), (7, 380), (8, 196), (9, 136), (10, 71), (11, 47), (12, 39), (13, 20), (14, 16), (15, 12), (16, 6), (18, 5), (17, 2), (19, 2), (22, 2), (1, 1), (24, 1), (20, 1)]
plt.loglog(data1, basex=2, basey=2, label='N1')
plt.show()