igrf15 
 13  6371.2 2015.0
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  2  0  -2445.10     0.00
  2  1   3012.90 -2845.60
  2  2   1676.70  -641.90
  3  0   1350.70     0.00
  3  1  -2352.30  -115.30
  3  2   1225.60   244.90
  3  3    582.00  -538.40
  4  0    907.60     0.00
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  4  2    120.40  -188.70
  4  3   -334.90   180.90
  4  4     70.40  -329.50
  5  0   -232.60     0.00
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  5  2    192.40   197.00
  5  3   -140.90  -119.30
  5  4   -157.50    16.00
  5  5      4.10   100.20
  6  0     70.00     0.00
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  6  3   -129.90    58.90
  6  4    -28.90   -66.70
  6  5     13.20     7.30
  6  6    -70.90    62.60
  7  0     81.60     0.00
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  7  2     -6.80   -19.50
  7  3     51.80     5.70
  7  4     15.00    24.40
  7  5      9.40     3.40
  7  6     -2.80   -27.40
  7  7      6.80    -2.20
  8  0     24.20     0.00
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  8  2    -16.90   -18.30
  8  3     -3.20    13.30
  8  4    -20.60   -14.60
  8  5     13.40    16.20
  8  6     11.70     5.70
  8  7    -15.90    -9.10
  8  8     -2.00     2.10
  9  0      5.40     0.00
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  9  4      0.70    -6.80
  9  5    -13.30    -6.90
  9  6     -0.10     7.80
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  9  8     -9.10    -4.00
  9  9    -10.50     8.40
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 13 13     -0.30    -0.80