                          a                  b
0                       NaN                NaN
1        0.6363804519949326  6.363804519949328
2        0.9831735426648135  4.809047134903848
3        1.3391127126827043   7.61478232031156
4        1.6970022370972768  9.758261868412484

[5 rows x 2 columns]