This particular chart is not derived directly from the two charts above it that are included in the same post (#21). Its purpose is to show three types of S/R, not to illustrate a "zoom in".
At the time I drew it, the bulk of the trading activity was between 1760 and 1800, within the hinge, with the midpoint, or greatest number of trades, at 1780. Now, however, with so much trading activity between 1760 and 1710 over the past few days, the volume is more evenly spread across a wider zone.