We present an analysis of the Evershed effect observed with
a resolution of 0.2 arcsec. Using the new Swedish 1-m
Solar Telescope and its Littrow spectrograph,
we scan a significant part of a sunspot penumbra.
Spectra of the non-magnetic line Fe I 7090.4 A
allows us to measure Doppler shifts without magnetic
contamination. The observed line profiles are asymmetric.
The Doppler shift depends on the part of the
line used for measuring, indicating that the velocity
structure of penumbrae remains unresolved even with
our angular resolution. The observed line profiles are
properly reproduced if two components with velocities between
zero and several km/s co-exist in the resolution elements.
Using Doppler shifts at fixed line depths, we find a local
correlation between upflows and bright structures,
and downflows and dark structures. This association is not
specific of the outer penumbra but it also occurs in the inner
penumbra. The existence of such correlation was
originally reported by Beckers & Schroter (1969), and it is
suggestive of energy transport by convection in penumbrae.