Dual AGN fraction as a function of redshift. The purple square shows the inferred dual AGN fraction from GA-NIFS observations, for the three newly discovered dual AGNs; instead, the violet symbol displays the fraction obtained also considering the two candidate dual AGNs; both measurements include 1σ Poisson errors for small numbers. The different curves represent the predicted AGN fractions obtained from an extension of the Volonteri et al. (2022) simulations up to z ∼ 6, passing different threshold criteria (as labelled). Notably, the figure shows that the GA-NIFS measurements moderately exceed the predictions obtained for thresholds that mimic our observational criteria, hence with projected distances d_p < 10 kpc, log(L_{bol,  A}) > 45 (for the primary AGN and the parent population) and log(L_{bol,  B}) > 44 (for the secondary AGN), shown with a blue dashed curve (and Poissonian 1σ intervals in lightblue). The top panel shows the parent sample distributions of GA-NIFS sources (purple histogram) and simulated AGNs (blue for log(L_{bol,  A}) > 45, grey for log(L_{bol,  A}) > 43); we note that simulations at z > 5 suffer from poor statistics.