Parallel lines (original regression lines), channel lines (original regression channel lines), linear regression lines, linear regression belts, standard deviation channels, ascending channels, descending channels Usage: Also known as pipeline lines, they are straight lines parallel to the trend lines, which pass through the highest or lowest points of prices in the recent period. These two lines run in the middle of the price and have obvious pipeline or channel shapes. The main function of the channel is the range of ceiling prices, so that it will not become too outrageous. Once the channel is determined, the price will change in this channel. If the channel line is effectively broken by the price, it often means that the trend will change greatly. When the channel line is broken by the price, the rising or falling speed of the trend will be accelerated, and new high or low prices will appear, and the original trend line will be abolished, and the trend line and pipeline line will be redrawn according to the new high or low prices. Many traders take advantage of the price breakthrough pipeline to increase or decrease their positions.