Measure the range Asia built, then step that same distance away from it. The multiples are not predictions — they are where the day runs out of room, marked before it gets there.
What gets measured — Asia's high to Asia's low, and nothing else. A projection built on a range you drew loosely is loose in every multiple that follows.
What the multiples are — One range added above and below, then two. They are levels price tends to stall at or reach for, not targets you are owed.
How to use them — As a map of the day's room. If the first projection has already been reached by London, the day is further along than it feels.