Table 3.

Parameters for Fig. 5

Figure	5A, B	5C, D
DX	0·0185	0·0007
Cg	0·0125	0·001
Xth (changing at time)	0·035	0 (1000), 0·15 (1100), 0·075
Initial radius	1	0·25
Δt	0·1	0·05
A gradient: max.–min.	Y10 : 6–1	– (Y30 + Y32) : 13·9–1·2 (shown in Fig. 7B)
Shown at time	250, 1000	1100, 2500