# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0979503         0.0115847    
     0.460000          0.700000          0.127515        0.00730417    
     0.700000           1.00000          0.132614        0.00666422    
      1.00000           1.54000          0.235177        0.00465635    
      1.54000           2.40000          0.236266        0.00387790    
      2.40000           4.80000          0.194084        0.00324750    
      4.80000           10.0000          0.145638        0.00415117