docs: def read_14c(fl):
      """Create CalibCurve instance from Bacon curve file
      """
      indata = pd.read_csv(fl, index_col=None, skiprows=11, header=None,
                           names=['calbp', 'c14age', 'error', 'delta14c', 'sigma'])
      outcurve = CalibCurve(calbp=indata['calbp'],
                            c14age=indata['c14age'],
                            error=indata['error'],
                            delta14c=indata['delta14c'],
                            sigma=indata['sigma'])
      return outcurve