From your profile you will see that the first session will look in a straight line, but enough to force construction points lai dep do will cause reduced speed and enough to trap the particle micron 1100 will begin to flow.
Be seen as the beginning of the profile will look like a straight line, but as he points the dep construction is made to degrade and by 1100 micron particle trap that is starting to flow out.
From profile will see first will look straight but when I go near the point construction has strong dep shall do to speed decreases, and when the 1100 micron Particle not trap will start flowing out