# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.129595        0.00443963    
     0.460000          0.700000          0.149343        0.00409322    
     0.700000           1.00000          0.164406        0.00520986    
      1.00000           1.54000          0.236712        0.00726066    
      1.54000           2.40000          0.246439         0.0125239    
      2.40000           4.80000          0.325441         0.0191186    
      4.80000           10.0000          0.308613         0.0472515