Impact of different reduction pipelines on the recovery of newly found NEOs. The graph shows the time evolution of the coordinate differences (Δα, Δδ)_MPC and (Δα, Δδ)_PRAIA between orbit solutions derived from different data sets with respect to the nominal solution. The nominal orbit of Apophis has been derived using all available data (optical and radar). The MPC or PRAIA solutions are derived from fitting orbits to observations performed during the first night of the duplicated data sets D_PRAIA and D_MPC.