k1 = a_exp
k2 = a_mend
k3 = a_log
k4 = a_lin
k5 = a_surf
k6 = a_gomp
k7 = a_bert
k8 = b_mend
k9 = b_log
k10 = b_lin
k11 = b_surf
k12 = b_gomp
k13 = b_bert
k14 = c_gomp
k15 = tumour