Adaptive optics 1 Dust extinctions 1 Embedded cores 1 HII region 1 HII regions 1 ISM : clouds 1 ISM: clouds 1 ISM: individual object: (infrared dark cloud g333.73 + 0.37) 1 ISM: individual objects ISM: individual objects: (IRDC G333.73 + 0.37) 1 Infrared devices 1 Light sources 1 Line data 1 Stars 1 Stars formation 1 Stars: pre-main sequence 1 Young stellar objects 1 dust, extinction 1 stars: formation 1 stars: pre-main-sequence 1