The magnetization file contains three columns, beginning of period (Myr), end of period (Myr) and magnetization (A/m, amperes per meter). To use the magnetization file filename when running Magellan the -m option can be used followed by the magnetization file (magellan -m filename). Equivalently the magnetization file can be specified in the configuration file, with the key magnetization=filename. The magnetization used controls the amplitude of the magnetic wiggles.
Here is an example of a magnetization file
% Everything written after the percentage sign is a comment
% This is a plain text file with the format below
% start(Myr) end(Myr) magnetization(A/m)
0 0.78 20
0.78 10 10
10 118 5
2010-08-03