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The process of nonsequential two-photon double ionization of helium is studied by two complementary numerical approaches. First, the time-dependent Schrödinger equation is solved and the final wave function is analyzed in terms of projection onto eigenstates of the uncorrelated Hamiltonian, i.e., with no electron-electron interaction included in the final states. Then, the double ionization probability is found by means of a recently developed approach in which the concept of absorbingarXiv:1006.1984v2 fatcat:e7l7ffxb3fe2behaevdupe5fpq