Eccentricity during Jacobi captures. Left panel: histogram in percent of the mean eccentricity of the binary during captures (initial captures in red and dynamical captures in blue). The dark blue line represents only dynamical captures with a single close encounter (i.e., flybys). Jacobi captures produce rather eccentric binaries. A significant proportion are in the very high eccentricity range (e ≳ 0.9), for which Post-Newtonian corrections can be significant at the pericenter. Right panel: percentage histogram of standard deviation of eccentricity during captures. These variations may permit a very high eccentricity during the capture, despite the lower mean eccentricity.