# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.288738        0.00758479    
     0.460000          0.700000          0.311854        0.00768837    
     0.700000           1.00000          0.180758         0.0102552    
      1.00000           1.54000          0.222045         0.0113178    
      1.54000           2.40000          0.384136         0.0137023    
      2.40000           4.80000          0.339306         0.0125211    
      4.80000           10.0000          0.192561         0.0122765