Can someone interpret this to something more understandable? So the damping curve linear, slightly progressive, on the compression side and a bit digressive on the rebound side of the curve? The different colors represent the tuning range offered by the knobs? Why doesn't the curve split at 0 force?

Tried looking up some other curves and they're not as straight and consistent as this. There's even a bit of funny business going on in them, possibly hysteresis.