def cosmo_pars(Partype=None):
    """Cosmological parameters as measured by various experiments.
    Input  :- Cosmological parameter source, options are:
            'wmap3'    : WMAPSNLS (Spergel et al. 2007).
            'wmap5'    : WMAPSNBO (Komatsu et al. 2008).NOT IMPLEMENTED YET
            'wmap9'    : WMAP9BAOH0 (Hinshaw et al. 2013).NOT IMPLEMENTED YET
            'planck'   : planck full mission (Ade et al. 2015).NOT IMPLEMENTED YET
    Output :- Disctionnary containing cosmological parameters.
          - Disctionnary containing cosmological parameters errors
            [1sigma lower error, 1sigma upper error].
     Tested : ?
         By : Maayane T. Soumagnac Feb 2019. Inspired by Eran's function of the same name
        URL :
     Example:[Par,ErrPar]=cosmo_pars('wmap3')
     Reliable:  """
    if Partype is None:
        Partype == 'wmap3'
    Par = dict()
    ErrPar = dict()
    if Partype == 'wmap3':
        Par['H0'] = 70.4
        ErrPar['H0'] = [-1.6, 1.5]
        Par['OmegaM'] = 0.268
        ErrPar['OmegaM'] = [-0.018, 0.018]
        Par['OmegaB'] = 0.03105
        ErrPar['OmegaB'] = [0, 0]
        Par['OmegaK'] = 0.986
        ErrPar['OmegaK'] = [-0.017, 0.017]
        Par['OmegaL'] = 0.716
        ErrPar['OmegaL'] = [-0.055, 0.055]
        Par['OmegaRad'] = 0.0
        ErrPar['OmegaRad'] = [-0.0, 0.0]
        Par['W'] = -1
        ErrPar['W'] = [-0.0, 0.0]
        Par['OmegaM_H2'] = 0.1324
        ErrPar['OmegaM_H2'] = [-0.0041, 0.0042]
        Par['OmegaB_H2'] = 0.02186
        ErrPar['OmegaB_H2'] = [-0.00068, 0.00068]
        Par['Tau'] = 0.073
        ErrPar['Tau'] = [-0.028, 0.027]
        Par['Ns'] = 0.947
        ErrPar['Ns'] = [-0.015, 0.015]
        Par['Sigma8'] = 0.776
        ErrPar['Sigma8'] = [-0.032, 0.031]
    return Par, ErrPar
