Does anyone know what format the MRTG [ip]_[port].log files are in?

Here is a top(6) sample of my 10.6.35.1_25.log log file:

1036567881 2313865839 3040227868
1036567881 937 713 937 713
1036567581 1561 229 1561 229
1036567500 1831 240 2561 273
1036567200 2473 643 2561 1647
1036566900 2312 1305 2513 1647


?!?

The first colum may be Unix timestamp (seconds since '1970-01-01 00:00:00' GMT), if sow it is:

2002-11-06 08:31:21
2002-11-06 08:31:21
2002-11-06 08:26:21
2002-11-06 08:25:00
2002-11-06 08:20:00
2002-11-06 08:15:00

all explaind here: http://people.ee.ethz.ch/~oetiker/webtools/mrtg/logfile.html

Thanks!