Magnetic anomaly picks were digitized from Figure 2 in the following publication:

Jacob, J., J. Dyment, and V. Yatheesh (2014), Revisiting the structure, age, and
evolution of the Wharton Basin to better understand subduction under Indonesia,
J. Geophys. Res. Solid Earth, 119, 169-190, doi:10.1002/2013JB010285.

EarthByte 2014 [via Maria Seton].