# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.387045        0.00394638    
     0.460000          0.700000          0.398754        0.00414008    
     0.700000           1.00000          0.512440        0.00496279    
      1.00000           1.54000          0.521368        0.00601772    
      1.54000           2.40000          0.451605        0.00572353    
      2.40000           4.80000          0.335568        0.00623109    
      4.80000           10.0000          0.229839        0.00853203