  A spatially resolved analysis of the lobes of the radio galaxy Pictor A has
been performed for the first time starting from a 50 ksec XMM-Newton
observation. Magnetic field, B_{IC}, particle density, particle to magnetic
field energy density ratios have been measured. Our study shows that B_{IC}
varies through the lobes. On the contrary, a rather uniform distribution of the
particles is observed. In both the lobes, the equipartition magnetic field,
B_{eq}, is bigger than the Inverse Compton value, B_{IC}, calculated from the
radio to X-ray flux ratio.
