Parameters read by alm2map_cxx:

nlmax (integer):
  maximum order of l

nmmax (integer):
  maximum order of m (must not be larger than nlmax, default=nlmax)

infile (string):
  input file containing the a_lm

outfile (string):
  output file name for the Healpix map(s)

nside (integer):
  nside parameter for the output map(s)

polarisation (bool):
  if false, only the intensity map is generated,
  if true, maps for I, Q and U are generated

fwhm_arcmin (double, default=0):
  FWHM in arc minutes of a Gaussian beam, which is used to smooth
  the a_lm

pixel_window (bool, default=false):
  if true, the a_lm are multiplied by the appropriate pixel window function

if (pixel_window)
  healpix_data (string):
    directory containing the Healpix data files
endif

double_precision (bool, default=false):
  if false, a_lm and maps are read/written in single precision,
  otherwise in double precision.