# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.132591        0.00584991    
     0.460000          0.700000          0.130612        0.00433346    
     0.700000           1.00000          0.115062        0.00438297    
      1.00000           1.54000          0.102429        0.00399959    
      1.54000           2.40000         0.0856545        0.00514581    
      2.40000           4.80000         0.0871422        0.00596170    
      4.80000           10.0000         0.0799919        0.00786045