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Figure 1
(a) The lowest-order skeleton Keldysh diagram for the X-ray absorption intensity. (b), (c), (d) The resonance Keldysh diagrams. Coulomb lines are connected to the same time leg. |
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Figure 1
(a) The lowest-order skeleton Keldysh diagram for the X-ray absorption intensity. (b), (c), (d) The resonance Keldysh diagrams. Coulomb lines are connected to the same time leg. |