  We present the abundance ratios [X/H] of a large set of chemical species with
condensation temperatures from 75 to 1600 K in an almost complete set of 105
planet-host stars and in a volume-limited comparison sample of 88 stars without
any known planets. The large range of different Tc covered by all the analysed
elements allows us to investigate possible anomalous trends of [X/H] vs. Tc in
targets with planets with respect to comparison sample stars. This can give
important hints for the detection of pollution events and for the understanding
of the relative contribution of the differential accretion to the average
metallicity excess found in planet host stars.
