Fix the top line of the "BBMFI" to 1, and the bottom line to 0.
Indicates where "Money Flow Index" is located between the top and bottom lines.
If it's bigger than 1, it's overbuying. If it's less than 0, it's overselling.
Consider a trade if you are out of range from 0 to 1.
It's also a good trade timing to out of range and come back in.