The closing (c) is the closing price, the opening (o) is the opening price, the high (h) is the highest price, and the low (l) is the lowest price, which means that the average line takes the closing price and the opening price. The index is exponentially weighted, and the median price is (H+L)/2, that is, the highest price+the lowest price divided by 2, and so on. The data of the previous indicator and the data of the first indicator are used for indicator superposition.