When He marks a measure his time is by definition, \(t_{ex}\). In their asymptotic form (ideally at \(t=\infty\)) the two tables contain the same information (say the She table in a "integral" form, and the He table in a "derivative" form), but for any time \(t\), the tables contain mostly complementary information that They must use jointly to reconstruct where waters went.
They found useful to build the cumulative He table , i.e.