def METHOD_NAME(line):
    """Guess which variant of PQR format this line is
    Parameters
    ----------
    line : str
      entire line of PQR file starting with ATOM/HETATM
    Returns
    -------
    flavour : str
      ORIGINAL / GROMACS / NO_CHAINID
    .. versionadded:: 0.18.0
    """
    fields = line.split()
    if len(fields) == 11:
        try:
            float(fields[-1])
        except ValueError:
            flavour = 'GROMACS'
        else:
            flavour = 'ORIGINAL'
    else:
        flavour = 'NO_CHAINID'
    return flavour