Fig. 2. Contours of the objective function OF(b) in the (a) 
s–n, (b) 
–n, (c) s–, (d) r–n, (e) Ks–
, and (f) r–Ks parameter planes
Fig. 2. Contours of the objective function OF(b) in the (a) s–n, (b) –n, (c) s–, (d) r–n, (e) Ks–, and (f) r–Ks parameter planes