There is slight different in the value of matter density between the Planck18 instance and the Planck’s paper. Similar problem also present in Planck15.
I’m wondering where this slight difference come from.
(table 2 in Planck 2018 results. VI. Cosmological parameters)
>>> import astropy
>>> astropy.__version__
'5.3.3'
>>> from astropy.cosmology import Planck18
>>> Planck18.H0
<Quantity 67.66 km / (Mpc s)>
>>> Planck18.Om0
0.30966
>>> Planck18.Ode0
0.6888463055445441
(values in Planck18)
