Basic idea, though, is that all these labs received the same samples and they ran things the way they normally do. Some use in-gel digestion, some used SP3, some used EvoSep+ Exploris or Tribrid or TimsToF+ NanoElute, the U3000 and the EasyNLC all make appearances. You see DDA and DIA.
Okay, so that just sounds like an ABRF style competitive study, right?
Then the results were processed and all the labs got to compare notes and run again.
T1 is labs doing their stuff without anyone else's notes and T2 is after getting a chance to see the other data/results/methods.