  We show that a vapor of multilevel atoms driven by far-off resonant laser
beams, with possibility of interference of two Raman resonances, is highly
efficient for creating parity-time (PT) symmetric profiles of the probe-field
refractive index, whose real part is symmetric and imaginary part is
anti-symmetric in space. The spatial modulation of the susceptibility is
achieved by proper combination of standing-wave strong control fields and of
Stark shifts induced by a far-off-resonance laser field. As particular examples
we explore a mixture of isotopes of Rubidium atoms and design a PT-symmetric
lattice and a parabolic refractive index with a linear imaginary part.
