Velocity-spatial features and ¹²CO spectrum of the MC co-located with Kes 73. Upper: ¹²CO spectrum from the extraction region of Kes 73 (orange circle in Fig. 7). The grey-shaded region highlights the 85–96 km s^–1 velocity range, corresponding to the MC material that overlaps the remnant. Bottom left: 24.8 GHz SRT image of Kes 73 (same as in Fig. 1, bottom right) with the 70, 100, and 120 Κ temperature levels referred to the ¹²CO emission integrated over the range 85–96 km s^–1. Bottom right: PV diagram of the 85–96 km s^{–1 12}CO material across the direction indicated by the red arrow. Red contours indicate the temperature levels at 5, 7, 9, and 11 K.