Radish - marks the racers with low odds (x10, x20) when they'll be within top 2 - double circle for higher, circle for lower if both are used.

Hare's Ear - marks when the place determined initially by the odds goes from even to odd (double circle) and odd to even (circle).

It looks simple this time as well.
Radish has marked two racers, so these two will be in the top two, x20 being higher.
Hare's Ear confirms that x20 will have an odd number placement and even Nazuna this time agrees.