1) BANKNIFTY Index Advance-Decline count
2) Each session, it reads the number of stock are +Ve or -Ve
3) Whichever the side +Ve or -Ve side moving stock is more than count will be plotted
4) at +/- 7 drawn a dotted line if Count is > = +/-7 Nifty is moving in a strong army
Eg:-
in the current session, 7 Stock is moving in +Ve direction & 6 are in -Ve direction
7 count will be plotted in the chart