These four panels show the posterior distribution with prior for four combinations of value of A and σ. The blue dotted line is the median estimator. The black dashed line is the mean estimator. The red, dashed line at is a reminder of the finite amount of probability that exists along the -axis due to the delta function term. No such line is needed in Figs. 7a and 7b because A = 0 there and the delta term does not contribute. This probability along the -axis is plotted underneath each contour plot.