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ALMA has allowed us to study the ejecta around evolved stars with unprecedented resolution. This extremely high resolution at the millimeter domain provides a unique tool to study the processes taking place in the innermost regions of these evolved stars. In particular, the processes leading to the mass ejections of the Red Supergiant stars are unknown. The pulsation process responsible for mass ejection in the intermediate mass AGB phase does not work in the high mass evolved stars. Therefore,doi:10.5281/zenodo.3585425 fatcat:t6nhwizez5hrnfghcjhozhxn3q