(a) Estimated dose-response curve (—) and uncertainty bands computed as pointwise |$95\%$| credible intervals from 100 000 samples from the posterior of the fitted curve (- - -). Vertical lines are the estimated BMD, |$\widehat{x}_{\tt {b}}$| (—) and the BMDLs: |$\widehat{x}_{\tt {l}}^\Delta$| (⁠|$\cdots$|⁠), |$\widehat{x}_{\tt {l}}^\tt {\,\,piv}$| (- - -), and |$\widehat{x}_{\tt {l}}^\tt {\,\,boot}$| (⁠|$-\cdot -$|⁠). (b) 100 000 samples from the approximate posterior distribution of |$\widehat{x}_{\tt {b}}$| (⁠|$\blacksquare$|⁠) and normal approximation to this distribution (—) upon which |$\widehat{x}_{\tt {l}}^\Delta$| is based.