Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Notes on the Dipole Coordinate System   A strong magnetic field can make it advantageous to work in a coordinate
system aligned with dipolar field lines. This monograph collect the formulas
for some of the most frequently used expressions and operations in dipole
coordinates.

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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom