print dfB
                     less
tindex
2001-01-01 09:03:12  5.64
2001-01-01 09:03:13  5.57
2001-01-01 09:03:14  4.81
2001-01-01 09:03:15  4.58
2001-01-01 09:03:16  5.18
2001-01-01 09:03:17  5.19
2001-01-01 09:03:18  4.79
2001-01-01 09:03:19  5.75
2001-01-01 09:03:20  4.90
2001-01-01 09:03:21  5.74
2001-01-01 09:03:22  5.19
2001-01-01 09:03:23  5.63
2001-01-01 09:03:24  5.38
2001-01-01 09:03:25  4.84
2001-01-01 09:03:26  5.21
2001-01-01 09:03:27  5.65
2001-01-01 09:03:28  6.34
2001-01-01 09:03:29  4.37
2001-01-01 09:03:30  5.00
2001-01-01 09:03:31  5.48
2001-01-01 09:03:32  5.41
2001-01-01 09:03:33  4.53
2001-01-01 09:03:34  5.33
2001-01-01 09:03:35  5.16
2001-01-01 09:03:36  5.25
2001-01-01 09:03:37  5.29
2001-01-01 09:03:38  5.70
2001-01-01 09:03:39  5.31
2001-01-01 09:03:40  5.46
2001-01-01 09:03:41  5.50
...                   ...
2001-01-01 09:07:45  5.48
2001-01-01 09:07:46  5.56
2001-01-01 09:07:47  5.75
2001-01-01 09:07:48  5.00
2001-01-01 09:07:49  4.39
2001-01-01 09:07:50  5.43
2001-01-01 09:07:51  4.76
2001-01-01 09:07:52  5.00
2001-01-01 09:07:53  5.53
2001-01-01 09:07:54  5.71
2001-01-01 09:07:55  5.75
2001-01-01 09:07:56  5.79
2001-01-01 09:07:57  5.33
2001-01-01 09:07:58  4.87
2001-01-01 09:07:59  4.89
2001-01-01 09:08:00  5.30
2001-01-01 09:08:01  5.36
2001-01-01 09:08:02  6.29
2001-01-01 09:08:03  5.15
2001-01-01 09:08:04  5.30
2001-01-01 09:08:05  5.09
2001-01-01 09:08:06  5.86
2001-01-01 09:08:07  5.00
2001-01-01 09:08:08  5.50
2001-01-01 09:08:09  5.13
2001-01-01 09:08:10  4.89
2001-01-01 09:08:11  5.34
2001-01-01 09:08:12  5.39
2001-01-01 09:08:13  5.57
2001-01-01 09:08:14  5.94

[303 rows x 1 columns]