Field Component: Int
Gufm1 - Secular variation model for last 2ky (Jackson, Jonkers and Walter, 2000)

Contour of Component: Int
image file of contour map using GMT

Image Int (001)
Year 1590

Image Int (003)
Year 1592

Image Int (005)
Year 1594

Gauss coefficients
image file of graph using gnuplot

Gauss Coefficients n=1,2