Examples of recovered spectra after adding artificial nebulae into the datacube prior to the empirical PSF subtraction. The surface brightness of the artificial nebulae was scaled with integer values of nspatial according to Eq. (4). After empirical PSF subtraction the spectrum was extracted from the residual datacube using the rC = 1.25′′ aperture (i.e. the same as in Fig. 2). The spectra are shown in units of 10-17 erg s-1 cm-2 Å-1. We note that artificial nebulae with nspat ≥ 5 can be unambiguously discriminated from the background for all objects.
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