# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.430475        0.00209823    
     0.460000          0.700000          0.426511        0.00198905    
     0.700000           1.00000          0.413571        0.00214361    
      1.00000           1.54000          0.398726        0.00217371    
      1.54000           2.40000          0.383694        0.00236580    
      2.40000           4.80000          0.358757        0.00260212    
      4.80000           10.0000          0.302743        0.00355776