Detection of mmCRLs toward the Orion Bar PDR. Left: map of the ¹³CO J = 3 – 2 integrated emission obtained with the IRAM 30 m telescope at a HPBW of 8″ (Cuadrado et al., in prep.). The blue dashed contours show the position of the H₂ dissociation front traced by the H₂v = 1 – 0 S(1) emission (from 1.5 to 4.5 × 10⁻⁴ erg s⁻¹ cm⁻² sr⁻¹ in steps of 0.5 × 10⁻⁴ erg s⁻¹ cm⁻² sr⁻¹; from Walmsley et al. 2000). Red contours show the [¹³C II] (²P_3/2−²P_1/2, F = 2–1) line emission at 1900.466 GHz mapped with Herschel/HIFI at a HPBW of 12″ (from 10 to 30 K km s⁻¹ in steps of 2.5 K km s⁻¹; from Goicoechea et al. 2015). Right: C41α and C39α recombination lines detected with the IRAM 30 m telescope toward three positions of the PDR. The cyan circles roughly represent the HPBW of our 3 mm-wave observations.