What are Fluctuations?
Fluctuations or Flucs are displayed to give punters a guide as to where the money is going in a race and to make the change in odds clear to see. When punters back a horse in, its odds will naturally decrease and vise versa if a runner is not attracting much money.
With markets for races being released days ahead from the jump, there can be a lot of betting activity in that time to causes flucs, but you will see the most movement in the hours and minutes leading up to the race!