I assumed that that when we see multiple levels at the same price only
one
of them can be taken into account.
When we see:
1000.50  size 560
1000.50  size 414
1000.50  size 1811
only one of these orders is correct, and you can easily spot which one
by
looking at the live market depth window.
3500 is not exactly right, I simply picked one order out of every
multiple price
segment to estimate the bid size and that's where 3500 comes  from.

On Aug 11, 3:35 pm, nonlinear5 <[email protected]> wrote:
> > It doesn't look right to me.
> > Since there is only 5 correct bid levels we can assume that
> > approximate cumulative bid size is 3500 vs 10967.
>
> Where does 3500 come from?
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