Left panel: initial FTMW survey in search for transitions of m-DCB (upper plot in black) and comparison with a simulation of the rotational spectrum of the species using the equilibrium rotational constants and centrifugal distortion terms calculated at the MP2/cc-pVTZ level of theory (lower plot in purple, see Table 1). Dashed-red lines indicate matches between the initial prediction and the actual line position. The simulation was performed using the PGOPHER software for a rotational temperature of 2 K. The quantum numbers assignment is written in the form (in purple). Right panel: view of the different (i.e. hyperfine and Doppler) components of the 3_{3 1} − 2_{2 0} transition (as indicated by the arrow). The quantum numbers associated with the assigned transitions are written in form I′, F′ − I″, F″ (in bluish green).