code: def _erads2bt(self, data, channel_name):
          
          cal_info = CALIB[self.platform_id][channel_name]
          alpha = cal_info["ALPHA"]
          beta = cal_info["BETA"]
          wavenumber = CALIB[self.platform_id][channel_name]["VC"]
  
          return (self._tl15(data, wavenumber) - beta) / alpha
docs: Computation based on effective radiance.