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  import reb dyno force numbers for r-zeta using levratio
ips    1 2 3 4 5 10 20 30 40 50
r-zeta  curve    .780 .7419 .7210 .7158 .71 .70 .70 .70 .70 .70
vdb / excel / zeta_backwards_shc.xlsx
     <----- percent increment  1.075 -----> vdb / excel / sh_soft_aver_stiff_rcratio_rz86.xlsx    
r-zeta 1ips 1.2 r-zeta 1ips 1.12 r-zeta 1ips 1.04 r-zeta 1ips 0.97 r-zeta 1ips 0.9 r-zeta 1ips 0.84 r-zeta 1ips 0.78 r-zeta 1ips 0.73 r-zeta 1ips 0.67 r-zeta 1ips 0.63 r-zeta 1ips 0.58