The function to convert \(C_{l}\) to \(D_{l}\) i.e.
\[D_{l} = C_{l}l(l+1)}/2\pi\]
- Parameters:
cl (np.ndarray, 1d-array) – Power spectrum
ell_start (int, default = 2) – The multi-pole ell value of first index of the \(C_{l}\).
- Returns:
dl (np.ndarray,1d-array)