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The study of the distribution of molecules in star forming regions helps to constrain the chemical models. The ``mini-starburst" region associated to W43-MM1, located at a distance of 5.5 kpc, includes a number of massive cores from ~1M⊙ to ~100M⊙ with pre-stellar and proto-stellar cores candidates (e.g. Motte et al. 2018, Nony et al. in prep.). Hence, it is an important sample of molecular cores at various evolutionary stages and moreover, it may contain the most massive cold core known in the whole Galaxy.
In this talk I will present the current state of our comparison of the molecular composition of the cores in W43-MM1. We used high spectral and spatial resolution data from ALMA Cycle 2 and Cycle 3 at 230 GHz, covering a total bandwidth of 4 GHz with a 0.5'' (~2400 AU) spatial resolution. In addition we had a spectral survey obtained at the IRAM 30m telescope covering a total of 153 GHz at 1, 2 and 3mm. I will introduce the technique I developed to substract automatically the continuum in order to study weak emission lines, similar to the one presented by Jørgensen et al. (2016) and better adapted to large regions of molecular emission. Finally I will present the molecular content and the physical parameters of the different continuum sources identified in Motte et al.
