# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0284500        0.00660944    
     0.460000          0.700000         0.0199247        0.00636973    
     0.700000           1.00000         0.0398194        0.00597444    
      1.00000           1.54000         0.0327119        0.00742360    
      1.54000           2.40000         0.0509801        0.00913531    
      2.40000           10.0000         0.0308178         0.0127207