# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.201471        0.00268091    
     0.460000          0.700000          0.222616        0.00238156    
     0.700000           1.00000          0.245813        0.00309762    
      1.00000           1.54000          0.254146        0.00301564    
      1.54000           2.40000          0.250150        0.00329554    
      2.40000           4.80000          0.212643        0.00432406    
      4.80000           10.0000          0.184809        0.00635542