  We study the size and shape of the final deposit obtained when a drop with
colloidal particles has dried on a super-hydrophobic surface made of
micro-posts. As expected, most of the particles lie inside a circular area,
which radius roughly corresponds to the Laplace pressure threshold for liquid
impalement inside the structure (Cassie-Wenzel transition), inducing a
coffee-stain deposit due to contact-line pinning. Less expected is the
observation of tiny deposits on top of posts in the area external to the main
ring, despite the low macroscopic liquid/solid friction. Experiments are
carried out varying the concentration in particles and initial volume of drops,
in order to determine the influence of these parameters on the size
distribution of deposits. A microscopic insight of the tiny deposits is
proposed, based on recent experiments of non-volatile liquid sliding drops.
