def paramError(s1, s2):
    """Add together s1 and s2 with the right delimiter \pm and surroundings $$

    Inputs
    ------
    s1 : pandas Series
      A pandas Series with main parameter, e.g. Teff
    s2 : pandas Series
      A pandas Series with error, e.g. Tefferr

    Output
    ------
    sout : pandas Series
      A new series with format like this: $5777 \\pm 42$
    """
    sout = '$' + s1.astype('str') + ' \pm ' + s2.astype('str') + '$'
    return sout