There are some arbitrary lines being drawn here. Is 62 miles really space? Or maybe it's 100 kilometers? So maybe "top" is kind of arbitrary too. Maybe it means

There are some arbitrary lines being drawn here. Is 62 miles really space? Or maybe it's 100 kilometers? So maybe "top" is kind of arbitrary too. Maybe it means 1st through 5th? Or maybe down to 10th? Or all but the last one?