URUANA SOURCE-DEPTH SENSITIVITY AUDIT Purpose: test whether current public aeromagnetic products support a stable quantitative source-depth estimate before manuscript submission. 2008 radial power spectrum (Spector-Grant style ensemble diagnostic): radius_km detrend_degree nx ny split_k_rad_km deep_apparent_km shallow_apparent_km deep_r2 shallow_r2 sse 20 1 26 26 0.858495 5.551841 1.524789 0.963330 0.948651 0.854061 20 2 26 26 0.858495 5.604974 1.513187 0.973049 0.949870 0.684638 25 1 34 29 0.783776 6.417905 1.518159 0.961767 0.857597 1.535315 25 2 34 29 0.783776 6.475509 1.507734 0.962410 0.854269 1.547405 30 1 40 32 0.713083 7.075102 1.668948 0.963711 0.883913 2.108053 30 2 40 32 0.713083 7.122216 1.667148 0.962096 0.884324 2.135611 35 1 46 36 0.631639 8.143837 1.776256 0.974419 0.892428 3.028405 35 2 46 36 0.750525 6.831753 1.523058 0.951686 0.897367 3.093459 40 1 54 39 0.586741 9.139335 1.990118 0.973376 0.890655 3.753299 40 2 54 39 0.686814 6.948986 1.730682 0.923902 0.901369 3.549004 45 1 60 42 0.647810 8.168164 1.733001 0.951212 0.855969 4.955273 45 2 60 42 0.841386 6.835095 1.775228 0.966698 0.831305 4.584258 50 1 66 46 0.497026 11.656694 2.168493 0.993153 0.838201 8.580310 50 2 66 46 0.497026 10.954110 2.164254 0.988848 0.837938 8.633345 Shallow apparent ensemble scale median=1.700 km, range=1.508-2.168 km. Deep component median=7.012 km, range=5.552-11.657 km. These are ensemble spectral scales under strong assumptions, not a unique body depth. 2008 Euler sensitivity: SI window_cells upward_km n depth_median_km depth_q25_km depth_q75_km source_dist_median_km rmse_median 0.0 5 0.0 70 2.528484 1.061279 4.454317 13.017196 2.950934 0.0 7 0.0 70 1.780664 0.967784 2.976071 14.994894 5.051819 0.0 9 0.0 64 2.025155 1.118261 3.177257 12.429729 7.079081 0.5 5 0.0 97 3.657487 2.011957 5.267068 14.219733 2.948162 0.5 7 0.0 93 2.697093 1.602518 4.533452 14.440827 5.396814 0.5 9 0.0 91 3.435695 2.411112 4.265577 13.132795 7.475744 1.0 5 0.0 94 4.709094 2.677382 6.940215 14.505577 3.699253 1.0 7 0.0 94 3.684388 2.323798 5.970869 14.711674 6.413068 1.0 9 0.0 91 4.703025 3.483582 5.836903 13.399872 9.253937 2.0 5 0.0 93 6.943602 3.387801 9.296100 14.484854 5.332705 2.0 7 0.0 93 5.579669 3.368024 8.734553 14.881240 9.245986 2.0 9 0.0 94 6.998517 5.051101 8.942531 14.285182 12.735351 0.0 5 1.5 86 4.849009 2.846919 6.324905 12.691350 1.048157 0.0 7 1.5 77 5.062184 3.052302 6.797168 11.854940 1.993868 0.0 9 1.5 72 4.628576 3.108521 6.752442 10.465466 2.812922 0.5 5 1.5 104 7.087583 5.383079 9.016052 14.185093 1.070881 0.5 7 1.5 103 7.355788 5.877779 10.108954 12.731173 2.021559 0.5 9 1.5 96 8.110037 6.516040 10.614480 11.011914 2.718632 1.0 5 1.5 97 8.727350 6.535674 11.508480 13.338257 1.326292 1.0 7 1.5 103 9.450930 7.398719 12.715098 12.777911 2.495184 1.0 9 1.5 95 10.415060 8.629480 13.727075 10.790384 3.370182 2.0 5 1.5 82 12.053044 8.398280 14.255497 12.833846 1.879367 2.0 7 1.5 86 12.947413 10.741236 15.743896 12.283374 3.575900 2.0 9 1.5 78 14.507652 11.822624 15.737589 11.528580 5.036646 0.0 5 3.0 85 5.978768 4.135425 7.887160 11.109242 0.652928 0.0 7 3.0 82 5.743876 3.681848 7.858823 11.742888 1.206251 0.0 9 3.0 77 5.245543 3.659759 7.286893 10.648123 1.877939 0.5 5 3.0 100 10.489478 8.396377 12.302852 11.556266 0.544359 0.5 7 3.0 99 10.723666 8.426409 12.446699 11.334027 0.926518 0.5 9 3.0 94 10.759158 8.404828 12.225012 11.107783 1.414661 1.0 5 3.0 99 12.774541 10.536521 16.213508 11.622669 0.699056 1.0 7 3.0 88 13.377916 11.120577 15.402653 10.516137 1.112421 1.0 9 3.0 91 13.563611 11.278564 15.645292 10.513660 1.692658 2.0 5 3.0 70 15.374365 12.401216 17.271002 11.535225 1.085774 2.0 7 3.0 60 16.091127 14.081611 17.642217 9.866846 1.857581 2.0 9 3.0 58 17.055962 14.987220 18.750805 8.525085 2.506079 Euler depth is strongly structural-index and upward-continuation dependent; no unique depth is supported. 2011 profile spectral sensitivity: y_window wavelength_band_km n depth_median_km depth_q25_km depth_q75_km r2_median 5-45 4-16 14 1.091707 0.706271 1.170999 0.368092 5-45 5-20 14 2.952718 2.528407 3.365899 0.601408 5-45 6-24 14 4.839864 4.102663 5.319236 0.697825 5-45 8-30 14 6.654449 5.957394 7.962566 0.819147 5-55 4-16 14 0.856896 0.448201 1.140360 0.335016 5-55 5-20 14 1.653043 1.086052 2.250338 0.514990 5-55 6-24 14 2.509166 1.600788 2.928476 0.633347 5-55 8-30 14 6.840309 6.245787 7.328344 0.846514 5-65 4-16 14 1.081069 0.779373 1.410332 0.329460 5-65 5-20 14 2.171385 1.823845 2.729116 0.556428 5-65 6-24 14 2.822565 2.430214 3.477893 0.697633 5-65 8-30 14 6.028501 5.431915 7.117377 0.793262 Profile spectral estimates vary materially with spatial and wavelength window; no unique source depth is supported. VERDICT: FAIL for a single robust source-depth estimate from current data. Do not add a precise Euler/source depth to the main paper. A ~2 km shallow spectral ensemble scale appears reproducible in the 2008 grid, but it should be described only as an apparent ensemble scale and not assigned to the Sao Domingos source without stronger source-specific convergence. SOURCE-SPECIFIC PROFILE CHECK AT THE MAPPED SAO DOMINGOS CROSSING The SGB vector geometry was used to fix the crossings before fitting local profile shape. The 2008 E-W line 10 and N-S tie line 9120 cross the same mapped concealed Sao Domingos segment. A linear-background + tanh transition model was varied across local half-windows 4-12 km and Gaussian smoothing 0-1 km. The fitted transition centers were systematically displaced several kilometres from the mapped crossing and width parameters were broad and model-window dependent. Therefore this parametric profile-width route FAILS as a source-specific depth estimator and is not used to assign depth. FINAL BOUNDARY Current data support a localized magnetic response associated spatially with the Sao Domingos structural sector, but they do not uniquely constrain causative-body depth or geometry. The robust 2008 radial spectral shallow scale (~1.5-2.2 km) is an ensemble-scale diagnostic only. Euler and 2011 profile spectra demonstrate material model/window sensitivity. No single source depth should be reported as a physical measurement.