Measured and calculated recombination rate coefficients of F-like Ni. The experimental result (connected filled circles) covers the energy range of 0–160 eV. The red solid line denotes the theoretically calculated recombination spectrum and the blue dashed line shows the RR background. The vertical bars are the resonance positions of and series estimated by the Rydberg formula. The blue solid line accounts for the theoretical DR rate coefficients of the captured electron with principal quantum number up to n_max = 1000.