However, observational estimates of molecular abundances, such as for HCN and CN, often rely on calculations of the sizes of the emitting regions. This is very unsatisfactory, and we have therefore initiated a project aimed at direct measurements of the sizes using the IRAM interferometer on Plateau de Bure. Furthermore, the molecular line brightness distributions provide information about the geometrical structures of the CSEs, and hence about the spatial properties of the stellar mass loss. For RW LMi we have also obtained other lines, see below.
Units are arcseconds.