Comparison of orbital and mass constraints between Galactic pulsar−WD systems, Galactic DNS systems, and J1227−6208. For J1227−6208, the extended uncertainties from the global (red star, Table 3) and the MeerKAT+UWL fits (magenta cross, Table 6) are quoted. Left: orbital eccentricity against companion mass from recycled binary pulsars in the Galactic field, distinguished by the nature of their companions. For systems without timing mass measurements (“Undetermined” in the legend), the lower constraints on the minimum and median M_c values derived from the mass function (assuming i = 90, 60 deg) are plotted. Right: WD mass against pulsar mass of PSR−WD systems in the Galactic field. References: constraints on systems besides J1227−6208 are taken from https://www3.mpifr-bonn.mpg.de/staff/pfreire/NS_masses.html and references therein, and from Camilo et al. (2001) (PSR J1435−6100), Cruces et al. (2021) (PSR J2338+4818), Edwards & Bailes (2001) (PSR J1157−5112), Gautam et al. (2022) (PSR J1952+2630), Jang et al., in prep. (PSR J1439−5501), Martinez et al. (2019) (PSR J0709+0458), Parent et al. (2019) (PSR J1932+1756), and Tan et al. (2020) (PSR J1658+3630).