# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.150067        0.00238713    
     0.460000          0.700000          0.155412        0.00220609    
     0.700000           1.00000          0.157818        0.00257116    
      1.00000           1.54000          0.171647        0.00301390    
      1.54000           2.40000          0.165242        0.00441454    
      2.40000           4.80000          0.165993        0.00601672    
      4.80000           10.0000          0.156279        0.00935791