Fig. 7

β1and \( {\beta}_{\begin{array}{l}2\\ {}\end{array}} \) represent the initial breakpoints. ρ1 and ρ2 show the moving pointer
β1and \( {\beta}_{\begin{array}{l}2\\ {}\end{array}} \) represent the initial breakpoints. ρ1 and ρ2 show the moving pointer