Roadmap for solving the nature of the DSO/G2 source. The ticks (✓) label the implications of the analysis of observational data by Valencia-S. et al. (2015), Witzel et al. (2014), and Shahzamanian et al. (2016). The question-mark (?) on the left implies that the NIR continuum of the DSO can be either thermal (standard interpretation) or non-thermal. The orange colour marks the possible nature of the DSO that would explain the observed characteristics.