We see from the scaled equations (71) that t c2 defines a stagnation timescale when experimental initial conditions are prescribed and λ 1. If the timescale t c2 is short, then the indicator reaction is essentially stationary over t c2 . This is because s 2 scales as a slow variable over t c2 , and the phase space trajectory should stay near the c 2 -nullcline over short timescales. Thus, if t c2 is small (i.e., t c2 min{t s2 , t s1 }), then this timescale translates to a scale over which the indicator reaction exhibits a "slow response". In fact, any timescale "t * " that satisfies t * min{t s1 , T s2 } qualifies as a stagnation timescale.