FOV coverage formula

Iker

How does FOV coverage behave on MID-70 LiDAR?
In the User Manual it is stated that after 1.5 seconds the MID-70 approaches 86% of FOV coverage and looking at figure 1.2.2 it seems like it has a logarithmical behavior. I have visited the Livox Wiki and the information about "Point Cloud FOV Coverage" or "Unique Scanning Pattern" doesn't say anything about how to calculate the FOV coverage over the integration time.
Is there any formula for this? This is an important matter to me, so I would really appreciate any help.
Thank you!