This value for the mass of the SMBH is just 25 per cent larger than that of the maser determination and 50 per cent larger that a previous stellar dynamical determination obtained via Schwarzschild models for long-slit data that provides an SMBH mass 15 per cent lower than the maser value.
Monthly notices of the Royal Astronomical Society. Oxford. Vol. 450, no. 1 (June 2015), p. 128-144