CO 1 – 0 integrated intensity map of CMa-l224. Yellow circles show all RT4 pointings, while white circles indicate those with the 22 GHz water maser detections: toward Gy 3–7 and source IRAS 07069–1026 in the main filament. Blue and red circles indicate the positions of water masers detected toward CMa–l224 with the GBT (Urquhart et al. 2011) and the Medicina telescope (Valdettaro et al. 2001), respectively (see text for details).