Detection map for the HARPS-N RV residuals of the three-planet fit for the HD 164922 system. The white part corresponds to the area in the period - minimum mass space where additional signals could be detected if present in the data, while the black region corresponds to the area where the detection probability is negligible. The red circles mark the position in the parameter space of the three planets orbiting HD 164922. The green areas denote the stability regions for additional companions (as determined in Sect. 6.1), while the gray area indicates the part of the system not explored by our orbital simulations.