Error in the elemental yields obtained with Eqs. (1) and (2) relative to those for the same element obtained with the thermodynamic trajectories provided by a hydrodynamic code for a SNIa model (see text for further details). Large open (red) circles give the errors belonging to a time of one day after the explosion, when the abundances of many iron-group elements are still dominated by radioactive isotopes. Small filled (blue) circles give the errors belonging to a time one hundred years after the explosion. Points belonging to some interesting couples of elements are highlighted by a small ellipse around them. For this comparison, we have only considered the layers with peak temperatures between 4.3 and 5.2 GK.