log line question

[Rene Kochen]

Given the following log line:

DEBUG [ReadStage:20] 11:39:07,028 collecting 0 of 2147483647: 
SuperColumn(2150726f70657274696573 [64617461:false:4@1319189945952058,])

What does "false:4" in the column mean?

Thanx!

Rene