Figure 1. Determination of 
and 
from the mass spectrometric records by minimizing the sum of squared deviations.
Illustration of the fitting procedure used to determine 
at a given 
of 0.12 cm s−1 (A) or both 
and 
(B). The sum of squares of deviations between experimental concentrations of C18O16O and their counterparts from the calculated C18O16O decay curve as obtained with the fitted values of 
/
are plotted vs. the value of 
(A) or vs. both the values of 
and 
(B).