Sample results from one SWGP realisation. In a hypothetical scenario, considering the long time span of one of the pulsars in our dataset PSR J1022+1001. The top panel shows the variations in n_e that can be modelled using SWGP perturbed from the mean value. The middle panel shows the corresponding time delays due to SWGP. The bottom panel shows the time delay when the deterministic signal with an ${\overline{n}}_{\mathrm{e}}$ of 7.9 is added on top of SWGP.