Table 2.

Parameters of ZoRLA and preZoRLA2.

Symbol	Description	Range	Used
pi,t	Clearance effort of SSi during simulation cycle t: the probability that SSi clears a detected compound	[0,1]	0–1a
Qi,t	Estimate of SSi's long-term, discounted cost as of events during simulation cycle t	(−∞,∞)	0–3500 ZoRLAa
			0–1.2 preZoRLA2a
gi	The value of the P-to-P b-signal gradient used by SSi	[0, ∞)	0–200 ZoRLA
			0–1 preZoRLA2
pBypass	Probability that a toxin bypasses an SS without being detected	[0,1]	0.6–0.99 ZoRLA
			0.9 preZoRLA2
h	A constant that adjusts the randomness of decisions	[0, ∞)	−70 ZoRLA
			0.1 preZoRLA2
α	Learning rate: determines the weight of newly observed costs in calculation of Q	[0,1]	0.1
β	Discount factor: determines the current importance of future costs	[0,1]	0.5 ZoRLA
			0 preZoRLA2
ka	Cost of detecting one r-signal	[0, ∞)	0–150 ZoRLA
			0–20 preZoRLA2
kc	Cost of clearing one compound	[0, ∞)	1
	Additional parameters for ZoRLA, only
(Xi,Yi)	Coordinates of SSi with respect to the center of the grid space	ℜ2	(4,4) – (28,28)
η	Uniform random noise (Eq. (3))	[0, grid radius]	[0, 15.5]

^aSimulation result.