healpixwindow
This IDL facility provides the window function in l associated with the
Healpix pixel of resolution Nside.
Location in HEALPix directory tree: src/idl/misc/healpixwindow.pro
FORMAT
IDL>
wpix=HEALPIXWINDOW(Nside [, Dim, Directory])
QUALIFIERS

Nside
 resolution parameter

Wpix
 the pixel window function, computed for the multipoles l in {0,...,4Nside}

Dim
 scalar integer, optional.
If absent or set to 0 or 1,
the output has size (4 Nside+1) and is the temperature
window function;
if set to Dim ,
the output has size (4 Nside+1,Dim)
and contains in that order :
the TEMPERATURE window function,
the GRAD/ELECTRIC polarization one
the CURL/MAGNETIC polarization one
the TEMPERATURE*GRAD one.

Directory
 directory in which the precomputed pixel window file is looked for.
default:$HEALPIX/data/
DESCRIPTION
healpixwindow computes the l space window function due to the finite size of the
HEALPix pixels. The typical size of a pixel (square root of its uniform surface
area) is
arcmin.
If a unpixelated sky has a power spectrum C(l), the same
sky pixelated with a resolution parameter Nside
will have the power spectrum
where W(l) is given by healpixwindow(Nside). The polarized
pixel window function is also provided (when Dim > 1).
This routine reads some FITS files located in the subdirectory data/ of the
HEALPix distribution, unless the keyword Directory is set otherwise.
RELATED ROUTINES
This section lists the routines related to healpixwindow

idl
 version 6.4 or more is necessary to run healpixwindow

gaussbeam
 computes the l space window function associated with
a gaussian beam

synfast
 f90 code to generate CMB maps of given power spectrum at a
given resolution (=pixel size)

anafast
 f90 code to compute the power spectrum of a HEALPix sky map
EXAMPLE:
Version 3.31, 20170106