S&P500 IndexIf the midline of the linear regression channel is broken, the price will continue to decline until it reaches the support line of the inner channel (in light blue), which is at one standard deviation.
In the less likely event that this support line is also broken, we have the support line of the outer channel (in yellow), which is at two standard deviations.
(Logarithmic price axis, channel starting from 2008)