pstate attribute in the Particle SOP

What do the values mean in the pstate attribute generated by the Particle SOP?

From what I see it looks like maybe:

  • 0 is unknown but occurs sometimes
  • 1 is a normal state
  • 4 might be related to splitting
  • 5 is stuck to a collision surface/boundary
  • 9 is unknown but occurs sometimes
  • 13 is unknown but occurs sometimes

Looks like a few people have asked about this in the past but I haven’t seen any definitive answers. It would be helpful to just have a full table of the values on the wiki.