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We present R-Matrix with time dependence (RMT) calculations for thephotoionization of helium irradiated by an EUV laser pulse and an overlappingIR pulse with an emphasis on the anisotropy parameters of the sidebandsgenerated by the dressing laser field. We investigate how these parametersdepend on the amount of atomic structure included in the theoretical model fortwo-photon ionization. To verify the accuracy of the RMT approach, ourtheoretical results are compared with experiment.

Angular distributions in two-colour two-photon ionization of He