Example of a rotational transition of o-DCB, recorded in the centimetre-wave domain using FTMW spectroscopy (black trace), showing resolved hyperfine lines, and comparison with simulations taking (in purple) and not taking (in bluish green) the Doppler splitting of each components into account (see text). Grey lines indicate the hyperfine components. Simulations were performed using the PGOPHER software and the best set of spectroscopic constants (Table 1). Quantum numbers associated with the assigned transitions are written in form I′, F′ − I″, F″.