DEX408 rear hubs

[4nd7]

Looking at the rear hubs i just want to be clear on something. One set are unmarked and the other is labelled L/1 and R/1.

Does this /1 refer to +1mm track width or +/- 1 degree? Only reason for the confusion is because i can't see any added pin angle despite being referred to as 1 degree hubs but i can measure a 1mm pin off set towards the inside of the hub!!