How to make ffmpeg effect not so strong?

Question

fmpeg

I use the command

-i "C:\1.mp4" -c:v libx264 -vf frei0r=vertigo:0.2 -pix_fmt yuv420p -crf 18 "C:\2.mp4" The

question is how to make the filter rotation not so strong?

I tried to change the value of vertigo: 0.2

I did not find any documentation on the Internet.
Thank you.