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Maxima of the Purcell factor (solid curve) and Lamb shift (dashed curve) as functions of the reflection coefficient 
for the quantum system presented in Fig. 1a. Inserts: (a) Purcell factor for different positions 
of an atom vs. 
in the units of 
. (b) Lamb shift for different positions 
vs. 
. Both inserts are shown for 
. The point 
corresponds to the center of the FPR.
