Comparison between the spatially resolved mass (M_orig) and the Sun-as-a-star estimated mass (M_scal). The red solid line shows the linear fit in logarithmic space, and the green dashed line indicates the one-to-one relation (y = x). (A) Full sample spanning more than 2 orders of magnitude (10¹⁰−10¹³ kg), with best-fit relation ﹩{\mathrm{log}}_{10}({M}_{{\rm{scal}}})=1.07{\mathrm{log}}_{10}({M}_{{\rm{orig}}})-0.73﹩ and the coefficient of determination R² = 0.82. (B) High-mass subsample restricted to M_orig,  M_scal > 10¹² kg, with best-fit relation ﹩{\mathrm{log}}_{10}({M}_{\mathrm{scal}})=0.97{\mathrm{log}}_{10}({M}_{\mathrm{orig}})+0.58﹩, showing that M_scal overestimates M_orig by a roughly constant factor across the high-mass regime.