import numpy as np, healpy as hp
import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 3.2))
for i, ns in enumerate([2, 8]):
    hp.mollview(np.arange(hp.nside2npix(ns)), sub=(1, 2, i + 1), cbar=False,
                cmap="tab20",
                title=f"l={int(np.log2(ns))}  (NSIDE={ns}, Npix={hp.nside2npix(ns)})")
    hp.graticule()