I've marked in red and green arrows where this range (purple dotted lines) has acted as resistance or support, it's clear that the purple range is a key level for determining if the Dollar will be bullish or bearish as sustained breakouts often occur within this range.
With farm roles lower (as expected) we have a strange scenario where by the Dollar, Gold, Oil and Dollar Yen all closed higher on Friday - Something is going on!
Labor day means Monday's markets will be slow and illiquid however we should be on alert from a break above or below the purple range especially as the BOY chief Kuroda is giving a speech 3:30am UK GMT time which may spark a move from the dollar.