it makes a bar chart then takes the widest part as a pivot and bends the tops and bottoms over to the left making a bell curve for a simple explanation,it stacks the first high lo 30 min bar say 5 to 10, the 2nd bar if 5-10 stacks, if there is a 4 or 11,1st print, it moves to the 1st column under the 5 or above the 10,all the 5 6 7 8 prints stack in a left to right row, so the highs and lows single prints, make a tail on the bell curve , the widst of that 5,6,7,8 makes tne nip, most folks left over long or short or reversion value