Fig. 13

A comparison of spatial and frequency domain inversion results for the Hawaiian basalt sample showing a the SIRM magnetic moments found using the TNT-NN unidirectional inversion (dipoles out of page) with 100 \(\upmu\)m dipole spacing, b the SIRM magnetic moments found using the Fourier technique of Lima et al. (2013) with 100 \(\upmu\)m dipole spacing, and c the Fourier solution where only the dipoles violating the non-negativity constraint (undershoot) are shown. The TNT-NN solution was obtained using an a 19.0 mm \(\times\) 25.0 mm spatial domain and the Fourier solution was obtained using a 20.0 mm \(\times\) 25.0 mm spatial domain. The cropped field of view for all images is 13.6 mm \(\times\) 19.1 mm. All units are Am\(^2\)