Mass-mass diagram for PSR J1946+2052. The regions consistent with the measured ${\dot{P}}_{\mathrm{b}},\dot{\omega },\gamma ,h_3,\varsigma$, and their 1-σ uncertainties are displayed in red, green, blue, purple, and orange. Note that Ṗ_b in this diagram has been corrected by removing the external contributions. The grey area is excluded by the mass function and sin i ≤ 1. The inset is an expanded view, showing in more detail the intersection of all PK parameters and the self-consistency of GR. The $\dot{\omega }$-line is based on the leading-order Equation (4). The (small) modifications related to the next-to-leading order contributions to the periastron advance are discussed in detail in Sect. 4.4.