Formal uncertainties (σ) of gravity field coefficients from the 2W mode at 40° and 90° orbital inclinations, alongside the reference model. Red and blue squares denote the positive and negative values of the reference J_n coefficients, respectively. The 40° inclination results in higher uncertainties due to limited latitudinal coverage, especially at low degrees. In contrast, the 90° polar orbit significantly reduces formal errors across all degrees, emphasizing the importance of comprehensive latitude coverage in achieving accurate gravity field recovery.