As shanglar said: Every number larger than 360=useless. Apart that every negative number is also useless. Why? Try etc -30 and 330 and you will find out why. When you put a number larger number than 180 it goes backwards. Put 360-[A number between 0 and 360] and it will be the same number as you put in the box but backwards. Thats why 180 0 0 become a line.