FIGURE 8:
Time plots corresponding to the points marked with *'s in
figures 6(a), 6(b) and 7. (a) These plots were obtained using the
original model with (i) , and
(ii) , . (b) These plots were
obtained using the modified model with and
, and (ii)
, . (c) These plots were obtained
using the modified model with and
(i) , and
(ii) , .
, 
and
(ii) 
. (b) These plots were
obtained using the modified model with 
and
, 
and
(i) 
, 
and
(ii)