# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.100125        0.00156679    
     0.460000          0.700000          0.108950        0.00159849    
     0.700000           1.00000          0.122100        0.00165906    
      1.00000           1.54000          0.148352        0.00198821    
      1.54000           2.40000          0.170221        0.00280119    
      2.40000           4.80000          0.175672        0.00417627    
      4.80000           10.0000          0.198398        0.00714457