Notes. The third channel previously discussed (primordial without any dynamical interactions) cannot form these eccentric tight binaries and is thus not included here. The first column shows how the binary was formed, either primordial or dynamically formed. The second column shows the total number. The third column shows the number of binaries that were involved in interactions after both binary components had evolved into WDs, forming the DWD. The fourth column shows the number of binaries that were dynamically formed before both components had evolved into WDs and the fifth column shows the number of DWDs that were directly formed in dynamical interactions.