Evolution of the nblob perturbation. Top row: cross-sections of the log number density, log (n [cm⁻³]), in the nblob model’s ecliptic plane at Δt ∈{0, 7, 9, 12} × 4.4828 kyr after injecting the perturbation (distances in pc). The displayed images show the (r, φ)-plane for ϑ = 0°, i.e. the ecliptic of the model. Centre row: synthetic observations of the above models in Hα [erg cm⁻² s⁻¹ sr⁻¹] at a distanceof 617 pc, face-on to the ecliptic (angular extent in degrees). The colour scale has been truncated on both ends; values below the minimum threshold are not displayed. Bottom row: synthetic observations of the same configuration in 70 μm dust emission [Jy sr⁻¹]. The solid angle per pixel is 5.07 × 10⁻⁸ sr.