Left: peak intensity within a beam area centered on the astrometric position of WISPIT 2b for the different realizations of the mirrored cubes. Right: intrinsic Gaussian line width (FWHM) as a function of extraction aperture radius for the 51 × 38 and 33 × 26 mas mirrored cubes. For each aperture, the spectrum within ∣v − v_b∣≤3 km s⁻¹ was fitted with a Gaussian profile, and the measured line width was corrected for the spectral resolution of 0.85 km s⁻¹ assuming Gaussian broadening. Error bars correspond to the 1σ uncertainties from the Gaussian fit.