Table 4. Optimal spacing of releases.

p0 = 0.6	p̂ = 0.2				p̂ = 0.3
Dispersal	D	RI	Rcrit	Tmin	D	RI	Rcrit	Tmin
Gaussian	13.06	3.30	2.48	17.60	16.26	4.10	3.19	30.22
Laplace	12.21	3.08	2.35	17.95	16.22	4.09	3.06	31.13
ExpSqrt	11.30	2.85	1.99	19.54	15.11	3.81	2.64	34.87
p0 = 0.8	p̂ = 0.2				p̂ = 0.3
Dispersal	D	RI	Rcrit	Tmin	D	RI	Rcrit	Tmin
Gaussian	11.26	2.86	2.05	14.17	13.43	3.39	2.61	24.26
Laplace	10.25	2.60	1.97	14.57	13.39	3.38	2.52	25.09
ExpSqrt	9.34	2.36	1.62	16.25	12.18	3.07	2.16	28.59

All distances are measured in units of σ. Assuming releases over 20% of the target area (i.e., ρ = 0.2 and p₀ = 0.6 or 0.8), we compare the spacing, D (distance between adjacent release centers), that produces the shortest time (in generations), T_min, required to reach 80% coverage as a function of p₀, initial infection frequency in release areas, p̂ and dispersal shape. The initial radius of these optimal releases, $R_{\mathrm{I}}=D\sqrt{\rho /\pi }$, is compared to the minimum radius, R_crit, required to initiate an expanding wave for the specified p₀ and p̂.