# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0675730        0.00441628    
     0.460000          0.700000          0.102262        0.00449495    
     0.700000           1.00000          0.118028        0.00658565    
      1.00000           1.54000          0.110387        0.00818349    
      1.54000           2.40000          0.121034         0.0103868    
      2.40000           4.80000          0.153448         0.0125987    
      4.80000           10.0000         0.0817172         0.0211738