(color online) (a) The transparency spectrum with the left coupling field power
as a parameter in the case of
and
. (b) The transparency spectrum with the coupling strength
as a parameter in the case of
and
. (c) The transparency spectrum with the right coupling field power
as a parameter in the case of
and
. (d) The transparency spectrum with the coupling strength
as a parameter in the case of
and
. The other parameters are the wavelength of the control fields
nm,
mm,
ng,
Hz,
Hz,
kHz,
, and
Hz.
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