# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0160568        0.00458735    
     0.460000          0.700000        0.00989842        0.00328606    
     0.700000           1.00000         0.0101296        0.00289919    
      1.00000           1.54000         0.0136458        0.00262713    
      1.54000           2.40000         0.0188422        0.00295594    
      2.40000           10.0000        0.00913765        0.00289282