> JBookTrader. The former has min,max,open and close. Whereas the latter
> has just one price - is this the median of bid/ask?, if so how would
> you specify the spread?

JBookTrader is meant to be used with highly liquid securities, such as
S&P 500 futures. For these securities, the bid/ask is virtually always
the same, i.e. 0.25 for the ES. So, it would be a waste of space to
record both bid and ask. That's why you only see one price, which is
the midpoint, from which you can determine both bid and ask by
subtracting/adding half the known spread from the midpoint price.

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