# Are there any programs or codes widely used for computing spherical multipole expansion, especially for CMB?

I have data of coordinates and values of a part of sky, and I'm supposed to calculate multipole expansion, change some components between some $\ell$s, and finally calculate back to values. The $\ell$ I will use could be as high as 10000, so it would much easier and more accurate to use a widely-used code.

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