Comparison between the SH, FL, and SNB thermal transport models. Left panel: initial Gaussian perturbation of temperature (black dotted curve) and heat fluxes corresponding to this perturbation for the case of the SH (blue solid curve), SNB (green dashed curve), and FL (red dashed curve) thermal transport models. The orange shading denotes the regions where pre-heating takes place (the effective width of the heat flux predicted by SNB is greater than that by SH and than the width of the initial temperature perturbation). Right panel: peak SH (blue solid curve), SNB (green dashed curve), and FL (red dashed curve) heat fluxes measured in units of maximum SH heat flux at 1 MK (Q₀). The black dotted curve denotes the relation of maximum SNB heat flux over the corresponding maximum SH heat flux.