Eccentricity vs. orbital period of all binary pulsars. Black crosses are pulsars in the Galactic plane, green triangles are pulsars in GCs (except M13), and red squares are binary pulsars in M13. The data used in this figure are from the ATNF Pulsar Catalog (https://www.atnf.csiro.au/research/pulsar/psrcat/)(Manchester et al. 2005).