The spreading rate file contains three columns, beginning of period (Myr), end of period (Myr) and full spreading rate (km/Myr). To use the spreading rate file filename when running Magellan the -s option can be used followed by the spreading rate file (magellan -s filename). Equivalently the spreading rate file can be specified in the configuration file, with the key spreadingrate=filename.
Here is an example of a spreading rate file
% Everything written after the percentage sign is a comment
% This is a plain text file
% start(Myr) end(Myr) full spreading rate(km/Myr)
0 50 20
50 89 25
89 118 15
2010-08-03
