k1 = emax
k2 = k1
k3 = k1_prime
k4 = k1_double_prime
k5 = phi1
k6 = k2
k7 = k3
k8 = phi2
k9 = phi3
k10 = k4
k11 = k4_double_prime
k12 = k4i
k13 = k4a
k14 = phi4i
k15 = phi4a
k16 = k6
k17 = F6
k18 = phi6
k19 = compartment