The format that is used by pymagmodel was first implemented for the gufm1 model and then adopted by the community to describe spline models. The model files are structured as follows:

The format that is used by pymagglobal was first implemented for the gufm1 model and then adopted by the community to describe spline models. The model files are structured as follows:

* The first line consits of the interval for which the model is valid, followed by several model parameters

* The second line contains three integers: the maximal spherical harmonic degree, a meaningless number and the number of splines

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@@ -16,4 +16,4 @@ pymagglobal comes with several models pre-included. Below is a description of th

| gufm1 | 1590 – 1990 AD | Jackson, A., A. R. T. Jonkers and M. R. Walker (2000): Four centuries of geomagnetic secular variation from historical records. Phil. Trans. R. Soc. Lond. A 358, 957–990 | Based on historical and modern data |

| CALS10k.2 | 8000 BC – 1990 AD | Constable, C., M. Korte and S. Panovska (2016): Persistent high paleosecular variation activity in Southern hemisphere for at least 10 000 years. Earth Planet. Sci. Lett.,453,78-86. | Based on archeomagnetic, volcanic and sediment data; Recent centuries constrained to agree in general with gufm1 |

| ARCH10k.1 | 8000 BC – 1990 AD | same as CALS10k.2 | Based only on archeomagnetic and volcanic data; Sparse data coverage for early millennia; Recent centuries constrained to agree in general with gufm1 |

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| ARCH10k.1 | 8000 BC – 1990 AD | same as CALS10k.2 | Based only on archeomagnetic and volcanic data; Sparse data coverage for early millennia; Recent centuries constrained to agree in general with gufm1 |