It is useful for tracking gaps on the market. The gap contains everything that is above the yellow line (histogram yellow bar) – crossing the upper border.
TP (towards a position);
SL (against a position);
entry prohibition at this point;
crossing the lower border (histogram gray bar) – flat
crossing the lower border upwards (histogram red bar) – beginning of a trend.
This indicator was first implemented in MQL4 and published in Code Base at mql4.com 19.08.2010.