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We present new calculations of the FeII emission in infrared and optical wavelength range in optically thin and optically thick cases. The calculations are based on 16-level, 35-level, 52-level, 142-level, and 920-level models; collisional excitation and radiative pumping are included. Implications of the results to models of FeII emission in the Orion Nebula and in quasars are discussed.