  Electromagnetically induced absorption (EIA) was observed on a sample of $%
^{85}Rb$ in a magneto-optical trap using low intensity cw copropagating pump
and probe optical fields. At moderate trapping field intensity, the EIA
spectrum is determined by the Zeeman effect produced on the atomic ground-state
by the trapping quadrupolar magnetic field. The use of EIA spectroscopy for the
magnetic field mapping of cold atomic samples is illustrated.

Atomic Physics