Table 3. Posterior distribution summaries for coefficients of the covariate-dependent detection function (see equation 4 in text).

	Mean	SD	95% CRI
βh0 [Intercept]	1.63	0.37	0.99, 2.46
βh1 [Beaufort sea state]	−0.39	0.10	−0.60, −0.22
βh2 [log(groupSize)]	0.16	0.11	−0.04, 0.40

Coefficients in the table describe the scale parameter (σ_h,b) (equation 4 in text). For a given truncation distance w and estimate of g_b(0), a smaller scale parameter (σ_h,b) implies a greater value for f(0) and thus a shorter effective strip width and smaller average detection probability (q_t). Thus, for example, the negative coefficient for the linear covariate for Beaufort sea state implies decreasing detectability with worsening (increasing) sea state.