Filament existing high-mass core. σ = 1.3 × 10²¹cm⁻² is the noise estimated in the local region from off-sources. The white contour is 3σ. The pink contour is the average surface density threshold for efficient star formation, 116 M_⊙ pc⁻² (Lada et al. 2010), corresponding to 7.3 × 10²¹ cm⁻². The green ellipses are cores. The high-mass cores are plotted with pink ellipses. The white solid circle is the IRAM 30m observation point. The red curve is the skeleton of the filament extracted by getfilaments (Men’shchikov 2013). The black squareis a class II YSO. The black triangle is a class 0/I YSO. The five-pointed star is a class III YSO.