IRP=6 Fatt and Klikoff function

IRP = 6 Functions of Fatt and Klikoff (1959)

${k_{rl}}\quad = \quad {\left( {{S^*}} \right)^3}$

${k_{rg}}\quad = \quad {\left( {1; - ;{S^*}} \right)^3}$

${S^*}\quad = \quad \frac{{\left( {{S_l}\; - \;{S_{lr}}} \right)}}{{\left( {1\; - \;{S_{lr}}} \right)}}$

with Slr = RP(1).

Restriction: RP(1) < 1.