F11 overlay: What do the parenthesis numbers of L= latency, T= mean?

Hi all,

I’m trying to understand the numbers shown by the F11 debug overlay. I don’t understand what the numbers in parentheses mean, or what T= means.

During a match, it shows something like:
x, 14, 8, 1
Only x fluctuates; the other three values stay the same.

After the match, on the return to map / post-game screen, it shows:
7, 7, 15, 1

In skirmish, T= appears to represent the actual realtime clock, and L= is always L=0, for example:
(0, 1, 62, 1)

Could someone explain:
What each number in parentheses represents?

  • What T= and L= stand for? Is L= latency?
  • Why L= is always 0 in skirmish?
  • Why the values differ during the match vs. after the match?

Also, I’d like to know how FPS is calculated — is it an averaged sampling rate over a certain period? What is its sample duration and interval? And how is ping calculated, and how often is this overlay refreshed?

Thanks!