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Add references to now-external package features
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# Re-exported Packages | ||
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Some features are simply re-exported functions from other, external packages. | ||
These packages have (typically) been extracted from this package since they can be used | ||
in a self-contained manner, independently of their application to CMB analysis. | ||
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For more information, see the documentation provided by each of the following packages: | ||
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## [AssociatedLegendrePolynomials.jl](https://github.com/jmert/AssociatedLegendrePolynomials.jl) | ||
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The associated Legendre polynomials (ALPs)constructs part of the eigenfunction basis for | ||
functions on the sphere and plays a very important role in analysis of signals on the | ||
sphere. | ||
In addition, the ALPs are required for the computation of | ||
[pixel-pixel covariance matrices](@ref man_pixelcov) that this package uniquely provides. | ||
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Note that this package re-exports the `AssociatedLegendrePolynomials` module under the | ||
name `Legendre` for both backwards compatibility with earlier versions of this package | ||
as well as for brevity. | ||
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## [SphericalHarmonics.jl](https://github.com/jmert/SphericalHarmonicTransforms.jl) | ||
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The spherical harmonic transforms are a key analytical techniques used in analysis of the | ||
CMB. | ||
They are built on top of the associated Legendre polynomials. | ||
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## [Healpix.jl](https://github.com/jmert/Healpix.jl) | ||
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The HEALPix pixelization is a very common mapping format used in CMB (and other fields of | ||
astronomy more generally). | ||
For instance, this package provides the necessary glue to perform spherical harmonic | ||
transforms on a (scalar, i.e. temperature field) map in the HEALPix format. |