M3 Data Structures

Here are the data structures with brief descriptions:

M3_BinEl	Mulitpole bin element
M3_BPSel	Binned power spectrum element
M3_CoordEl	Coordinate element
M3_FilterEl	Filter element
M3_Interval	Time sample interval
M3_MapEl	Map element
M3_PointingEl	Pointing element
M3_SparsePixelMatrixColumn	Sparse pixel-pixel matrix column designator
M3_SparsePixelMatrixData	Sparse pixel-pixel matrix structure
M3_SparsePixelMatrixEl	Sparse pixel-pixel matrix element

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