It depends on the market and variety. Generally speaking, the trend direction of the intraday band, as big as 4 hours and as small as 15 minutes, will be reflected in the chart. Some people look at the trend direction with the K-line of the sky chart, and I feel a little uncomfortable in the outer disk or the variety that changes greatly. Furthermore, when placing a single step, the period will be shorter, even as small as the time-sharing lightning diagram.