IISM-SW disentanglement in PSR J0030+0451. The upper panel shows the time series of the DM variations and the IISM models (dot-dashed green line) and of the SW and IISM combined (solid blue line). The data used are represented as black dots and red diamonds (where the red diamonds indicate the observations within 50° in Solar elongation and the black dots indicate the observations beyond 50°), while the discarded data points are in gray. Middle panel: DM residuals after subtraction of the IISM model only, and the lowest panel shows the DM residuals after subtraction of both the IISM and the SW models.