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Fig. 6. Representative fits of Eqn 2
to central O2 concentrations in an egg mass (A) with little initial
O2 depression (Tritonia challengeriana egg mass at
–1.5°C; fits shown in green) or (B) with substantial initial
O2 depression (Tritonia diomedea egg mass at 22°C;
fits shown in orange). x- and y-axes are scaled differently
in the two panels. When initial drawdown is slight, estimates of D
from down- and up-traces are similar, whereas when initial drawdown is large
they are divergent (see also Fig.
7).