Molecular lines observed towards the dust peak of I16293E with APEX. The vertical red dotted line shows the v_LSR of the core, 3.7 km s⁻¹. Given the complexity of the environment around I16293E, the rest velocity slightly changes depending on the molecule, as already pointed out in Lis et al. (2016) and Kahle et al. (2023). Both lines present in the panel of fully deuterated ammonia (ND₃), top right corner, are hyperfine components of the same rotational transition of ND₃ . The stick spectrum at the bottom of the panel of ND₃ shows the hyperfine structure of the transition. Their spectroscopic parameters are reported in Table 2.