# NOT RUN {
## At low resolution, a few data points can
## occupy a large pixel area, e.g.:
cmbdf <- CMBDataFrame(nside = 1, spix = c(1,2,3))
pix(cmbdf)
## The total number of Healpix points at nside=1 equals 12. As cmbdf has 3 Healpix
## it occupies pi = 1/4*(surface area of unit sphere)
geoArea(cmbdf)
plot(cmbdf, size = 5, hp.boundaries = 1)
# }
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