When catching a Pokemon, there is an inner colored circle that continuously starts at the outer circle and zooms in to zero. Landing a ball inside the circle gives an XP "throw" bonus depending on how small the circle is when the ball is thrown – Nice!, Great!, or Excellent! That throw bonus also corresponds to an increased catch probability.
Does the catch probability increase continuously as the inner circle size decreases? Or is the effect of the throw bonus discrete and tied to the three named bonus tiers?
Meaning, for example: if I get a Great! throw when the circle has barely shrunk from Nice! size to Great! size, is the catch probability boost the same as if I get Great! right before the circle is about to shrink to Excellent! size?