I wrote:
".top fluctuation is the top price that is commonly available in the betting ring where the race is held. Eg. if a race is at Rosehill, the top fluctuation is the top price that is commonly available in the Rosehill betting ring."

mr magic wrote:
Logic,
I think in a market where there is a reasonable variation in prices, the top fluc is the most generally available "good price" if that makes any sense.
For example, in Sydney there are about 15 rails bookies and there may be 5 betting 2/1, 9 betting 9/4 and one has 5/2 up. The fluc is given as 9/4.

I agree with you.
I thought that was also what I wrote!