This intraday chart of dow is plotted with gann lines............ the lines were not kept after the day has closed,
the first gann fans were kept in the early morning session and the second gann fan was kept around 11. the dow seems to follow the gann lines for support and resistance rather closely.
To know more about gann.....the books written by him is available free in the net........
if you are going to experiment with gann know that it is uncharted territory............ there are no one to say that you are wrong or right.......the proof is in the pudding (money).