def gtlike_spectrum_to_vectors(spectrum):
    """ Convert a pyLikelihood object to a python dictionary which can
        be easily saved to a file."""


    parameters = pyLike.ParameterVector()
    spectrum.getParams(parameters)

    npar = max(parameters.size(), 10)
    o = {'param_names': np.zeros(npar, dtype='S32'),
         'param_values': np.empty(npar, dtype=float) * np.nan,
         'param_errors': np.empty(npar, dtype=float) * np.nan,
         }

    for i, p in enumerate(parameters):
        o['param_names'][i] = p.getName()
        o['param_values'][i] = p.getTrueValue()
        perr = abs(p.error() * p.getScale()) if p.isFree() else np.nan
        o['param_errors'][i] = perr

    return o