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A figure to be compared with Fig. 1 of the present paper has been added in the version at http://arxiv.org/abs/physics/0007097
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This is in contrast to the “Λ” configuration of the three-level atomic system required for slow light (Ref. 2) where the pump laser does not produce an inverted population, in which case an adequate classical description is simply to reverse the sign of the damping constant for the pumped oscillator.
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