MFP equivalent of "Weighted Average Price of all bets placed" is...?

Hi,

the Directory Listing of Betfair prices has two columns which are the Weighted Average Price of all bets placed before 11:00am and before the off (in the win market for instance).  Today's horse racing win market file attached for info (screen shot of file).

The definitions given (at https://promo.betfair.com/betfairsp/prices/index.php) are:
 
PPWAP - Weighted Average Price of all bets placed pre-off
MORNINGWAP - Weighted Average Price of all bets placed before 11am GMT
MFP has market_volume and market_mbnum but I can't see an equivalent for WAP per selection as per the files in the Betfair prices directory given above.
If there isn't an equivalent already, how do I go about creating these for every selection in, say, horse racing win markets?
I'm guessing that I can use the "Remember" action to so something at 11:00AM which captures the MORNINGWAP and then another timed trigger before the off for WAP.
All help gratefully received!
regards
Wez

Sorry,

just found traded_avg_price variable!  Why do I always find it after posting?!

traded_avg_price = (P1*A1 + P2*A2 + ... + Pn*An) / (A1 + A2 + ... + An)

Help file says this considers any trade of 0.1p or above.  Can this threshold be varied to say £100?  If not yet, maybe in the next release?

thanks

Wez