2D spectral sections of the I20210 system. Left panel: the Hβ and [O III] region. Right panel: Hα+[N II] and [S II] region. In both panels, the trace centers of the main components are identified for reference (green dashed lines). The elliptical fits to the [O III] and Hα+[N II] emissions from the South Nebula are reported (green ellipses) along with the respective best-fit parameters and statistical uncertainties. In the right panel, the vertical features are sky lines, whereas the extrusion close to the [S II] emission of I20210N is a cluster of saturated pixels that is excluded from the IRAF extraction of the 1D spectrum.