Schneider sr3 b262bd syntax

Hi,

I've never worked on this range of PLC before, and am trying to make sense of the program currently loaded.

Using the manual I have most of it worked out, but there is one aspect I can't find reference to at all. Why are some of the timer references in inverse text? e.g.

M1----T1----T3-----t4----------------[M2

Thanks in advance