.php import fork reb dyno force numbers for r-zeta
  import fork reb dyno force numbers for r-zeta using levratio   fork r-zeta is linear, all .70 throughout the range  (fork r-zeta tends to be more linear, unlike shocks) vdb / excel / zeta_backwards_shc.xlsx
reb zeta -.95 reb zeta -.90 reb zeta -.85 reb zeta -.80 reb zeta -.75 reb zeta -.70 reb zeta -.65 reb zeta -.60 reb zeta -.55 reb zeta -.50 reb zeta -.45