Evolution of galaxy size--stellar mass relation from the Kilo Degree
  Survey
  We have obtained structural parameters of about 340,000 galaxies from the
Kilo Degree Survey (KiDS) in 153 square degrees of data release 1, 2 and 3. We
have performed a seeing convolved 2D single S\'ersic fit to the galaxy images
in the 4 photometric bands (u, g, r, i) observed by KiDS, by selecting high
signal-to-noise ratio (S/N > 50) systems in every bands.
  We have classified galaxies as spheroids and disc-dominated by combining
their spectral energy distribution properties and their S\'ersic index. Using
photometric redshifts derived from a machine learning technique, we have
determined the evolution of the effective radius, \Re\ and stellar mass, \mst,
versus redshift, for both mass complete samples of spheroids and disc-dominated
galaxies up to z ~ 0.6.
  Our results show a significant evolution of the structural quantities at
intermediate redshift for the massive spheroids ($\mbox{Log}\ M_*/M_\odot>11$,
Chabrier IMF), while almost no evolution has found for less massive ones
($\mbox{Log}\ M_*/M_\odot < 11$). On the other hand, disc dominated systems
show a milder evolution in the less massive systems ($\mbox{Log}\ M_*/M_\odot <
11$) and possibly no evolution of the more massive systems. These trends are
generally consistent with predictions from hydrodynamical simulations and
independent datasets out to redshift z ~ 0.6, although in some cases the
scatter of the data is large to drive final conclusions.
  These results, based on 1/10 of the expected KiDS area, reinforce precedent
finding based on smaller statistical samples and show the route toward more
accurate results, expected with the the next survey releases.
