Small numbers above aircrafts

Hi there,
In the newly updated IF map, what are the tiny numbers above other aircrafts? Can’t figure it out

The numbers above an aircraft on the map show how many flight levels higher or lower they are from you. :)

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Wow, thanks! I spent some time thinking the other day… would never have found it!
This can be closed now!

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@Pingu. MaxSez: After all these year I finally have the truth about those flight associated number, who a thunk it! Thanks Wizard !
Regards, Max

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