Dispersion measure versus the MSP duty cycle, δ. Green circles show MSPs with profiles which do not show an evident scattering tail – see δ values marked by an asterisk (^⋆) in Table 4. Light yellow squares show all other MSPs. Errors in DMs including δDM_orb (see Sect. 4.3) are smaller than the size of the marker for all MSPs. For MSPs without error bars, the uncertainty on δ is also less than the size of the marker. The top subplot shows the histogram of duty cycles for all detected MSPs.