Deep and very deep Coppock Curve buy signals are identified originally by the Coppock Curve and then depicted as time paths in Cycloops phase space for further study.
Cycloops sell signals, on the other hand, are identified originally in Cycloops phase space by the position of their time paths with respect to the superimposed light blue geometric figure. It follows that those sell signal time paths resemble one another.
It so happens that, as to the 100 trading days prior to each signal, the time paths of the 6 Cycloops sell signals observed since 12/1/61 sort themselves into 2 patterns.
For better scaling, the 1/28/00 Cycloops sell signal and the 5/30/03 deep Coppock Curve buy signal are omitted from the following DJIA chart.