# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.493836        0.00338485    
     0.460000          0.700000          0.568874        0.00321359    
     0.700000           1.00000          0.699823        0.00551039    
      1.00000           1.54000          0.711890        0.00968934    
      1.54000           2.40000          0.553461         0.0431975    
      2.40000           4.80000          0.167984          0.222558    
      4.80000           10.0000          0.816079          0.248726