Demographics of giant planets is a key information to constrain planetary systems formation processes, through comparison with outputs of population synthesis models. However, the data at hand, coming either from indirect techniques or from direct imaging are still limited and do not allow to build robust radial distributions of giant planets at all separations.

I will discuss the limitations of these individual techniques. In particular, I will present the results of a deep analysis we made on the radial distribution of giant planets based on radial velocity data, that highlight our poor knowledge on the distribution of giants in the 5-15 au range, a region where the biggest planets of our solar system orbit. 

Detecting giants in this region is not only important for statistical purposes, it is also important because the very presence of giant planets at such separations can have a dramatic impact on the content (Earth-mass planets) and architecture of planetary systems. 

I will show how coupling various techniques such as radial velocity, absolute astrometry (Gaia, Hipparcos) and relative astrometry (HCI, interferometry) can help fully characterizing giant planets in this crucial range of separations. New results on individual systems will be presented.