NIR diagnostic diagram. The line ratios obtained from the central region of IRAS 01072+4954 are shown in comparison to the ones calculated from non-spatially resolved observations of other sources taken from the literature. The different type of activity in those objects is represented as shown in the label. The observational division between starbursts, Seyferts and LINERS are shown by dashed lines. The ratio [Fe ii]λ1.644   μm/Brγ was converted to [Fe ii]λ1.257   μm/Paβ using theoretical values as explained in the text.