How fast does a unit need to be to dodge arrows?

Oranos turma can at 5.5, but Gaia ones can't at 5.0, but what about stuff that is 5.3?

As I understand it from Ippert's amazing excel file, most ranged units have a track rating of 5 meaning they hit anything with 5 speed or less - is that correct?

And only a small handful have a track rating of 6 meaning they can hit 6 speed units (priests/ Greek heroes).

So are you telling me it's a case of any unit with speed of 5.01 can't be hit by anything except priests and Greek heroes?