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Symmetric Trading Strategy

Hi all

I am trying to implement HFT in Limit Order book by Avellaneda & Stoikov (2008) https://www.math.nyu.edu/faculty/avellane/HighFrequencyTrading.pdf

Here authors have also mentioned about symmetric trading strategy where traders place bets at midpoints of ask & bid prices, does that mean optimal offered bid/ask price = (ask+bid)/2 ? If not, how this bets are placed?

It would be great if someone can offer some insight.

Best Regards

maitreyi