Obscuration duration (T_obsc) against delay duration (T_delay). The grey zone line is the 1:1 line. An eclipsing pulsar on this line would have no ingress and egress phases. The further a pulsar is from this line, the smaller is the fraction of the eclipse over which the beam is not detectable. Colours and shapes depend on the classifications, as given in Table 6: blue circles correspond to the “abrupt” eclipsers, PSRs J1513−2550, J1555−2908 and J2115+5448, red diamonds are the “progressive” eclipsers, PSRs J1628−3205, J2055+3829 and J2256-1024 and green stars are the “shallow” eclipsers, namely PSRs J1705−1903 and J2051−0827.