DM time series for 12 MSPs that show a detectable Solar wind signal. Individual DM measurements are plotted in grey, while running averages and their uncertainty are represented by solid grey and black lines, respectively. For faint pulsars onlyobserved with the LOFAR core, the running average is not plotted due to the low observing cadence. Only points with uncertainties less than three times the median uncertainty are plotted. The vertical dashed grey lines indicate the epochs of minimum angular separation from the Sun.