  We analyse spectropolarimetric observations of the penumbra of the NOAA AR
10953 at high spatial resolution (0.3"). The full Stokes profiles of the Fe I
lines at 630.1 nm and 630.2 nm have been obtained with the Solar Optical
Telescope (SOT) on board the Hinode satellite. The data have been inverted by
means of the SIR code, deriving the stratifications of temperature, line of
sight velocity, and the components of the magnetic field vector in optical
depth. In order to evaluate the gas pressure and to obtain an adequate
geometrical height scale, the motion equation has been integrated for each
pixel taking into account the terms of the Lorentz force. To establish the
boundary condition, a genetic algorithm has been applied. The final resulting
magnetic field has a divergence compatible with 0 inside its uncertainties.
First analyses of the correlation of the Wilson depression with velocity,
temperature, magnetic field strength, and field inclination strongly support
the uncombed penumbral model proposed by Solanki & Montavon (1993).
