Distribution of eccentricities for the WISE sources for which the period (filled symbols) or its harmonic (open symbols) is recovered to within 1%. Lower panel: eccentricities for the systems classified as EBs (orange; Mowlavi et al. 2023), Cepheids or RR Lyrae (purple; Ripepi et al. 2023; Clementini et al. 2023). Those without a classification are shown in black. The systems are displayed in no particular order along the y-axis. Upper panel: histogram of the distributions for the EBs, pulsating variables, and all SB1 solutions (the last one is divided by 250).