                          a                   b
0                       NaN                 NaN
1        0.4049800796812748  40.498007968127496
2        0.9666302149960798  23.126934345726905
3        1.7932228572684308  57.984909785729506
4        2.8798165927131625   95.22367469251311

[5 rows x 2 columns]