Graphical summaries of the observation log of the target young, nearby dusty stars observed with VLT/NaCo between 2009 and 2012. Top left: histogram of median seeing (image quality seen by the active optics sensor) with 0.2″ bin. The DIMM seeing has been overplotted with dashed columns. Top right: histogram of median τ₀ with 0.5 ms bin as calculated by NAOS. Bottom left: histogram of median airmass with 0.1 bin. Bottom right: histogram of explored parallactic angles with 10 deg bin.