Top left: velocity map of IRAS 16293A. Top right: spectral lines covered over the velocity gradient of IRAS 16293A. Bottom left: integrated emission map where the emission for the 338.360 GHz line of ¹³CH₃CN is integrated over channels between 0 and 6 km s⁻¹. Bottom right: velocity-corrected integrated emission map of the 338.360 GHz line of ¹³CH₃CN where only the line profile at each pixel is integrated over. The red star marks the peak continuum position in the PILS dataset of IRAS 16293A and the black cross marks the offset position where the spectra analysed in this work are extracted from. The red and blue circles mark the positions of the two continuum peaks A1 and A2, respectively, found by previous authors, using coordinates that have been corrected by the rate of position angle change with year determined by Pech et al. (2010).