Fig. 7
From: Using TNT-NN to unlock the fast full spatial inversion of large magnetic microscopy data sets
Comparison of SIRM magnetic sources within the Hawaiian basalt thin section. a The piecewise inverse solution produced using lsqlin using sample subdivision (for a cropped 13.6 mm \(\times\) 19.1 mm region of the original scan). b The inverse solution produced using TNT-NN for a cropped 13.6 mm \(\times\) 19.1 mm region of the original scan. The lsqlin solution for the same scenario is visually identical. c The inverse solution produced using TNT-NN for the full 19.0 mm \(\times\) 25.0 mm scan region cropped to a 19.1 mm \(\times\) 13.6 mm view. d Solution residuals for (a). High-magnitude residuals at subdivision interfaces are evident as blue fringing-fields at the sample boundaries. e Solution residuals for (b). The lsqlin solution residuals for the same scenario are visually identical. f Solution residuals for (c). The field of view of each image is 13.6 mm \(\times\) 19.1 mm, dipole orientation is out of page, and units are Am\(^2\) for a–c and nT for d–f