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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    1.00 .830 .770 .742 .737 .72 .70 .70 .70 .70
vdb / excel / zeta_backwards_shc.xlsx
     <----- percent increment  1.075 -----> vdb / excel / sh_soft_aver_stiff_rcratio_rz86.xlsx    
            rzeta = spr rate =      
get_rzeta =
zreb_target = 100_74_70
r-zeta 1ips 0 		r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0 r-zeta 1ips 0