Background-only reconstruction. The top panel displays the posterior mean of the background-only reconstruction (solid blue line) in comparison to the ground truth background signal response (dashed black line). The bottom panel shows corresponding latent position-space excitations ξ (purple solid line). The detection level for the line component was set to σ_thresh = 0.6 in prior units and it is displayed in red (solid horizontal line). The detected line positions for the given threshold σ_thresh are displayed as dashed vertical gray lines in both panels.