# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0228779        0.00160690    
     0.460000          0.700000         0.0255772        0.00138284    
     0.700000           1.00000         0.0231136        0.00169247    
      1.00000           1.54000         0.0260149        0.00161214    
      1.54000           2.40000         0.0223193        0.00229735    
      2.40000           4.80000         0.0299052        0.00243471    
      4.80000           10.0000         0.0232043        0.00390395