Positron annihilation spectrum of the Galaxy using the best-fit morphology model of Siegert et al. (2016). Shown are the SPI data points in black (≥3σ-bins), and four model components: narrow 511 keV line (red), broad 511 keV line (orange), ortho-positronium continuum (blue), galatic γ-ray continuum (green). The total model is shown as solid black line. The fitted parameters are shown in the legend. The units are 10⁻⁵   ph cm⁻² s⁻¹ keV⁻¹ for the continuum amplitude A_C, 10⁻³   ph cm⁻² s⁻¹ for the line fluxes I_N and I_B, and the positronium continuum I_oPs, and keV for the lines centroids E_N and E_B, and widths Γ_N and Γ_B. The positronium fraction f_Ps is measured to be between 0.97 and 1.00.