# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0773569        0.00328412    
     0.460000          0.700000         0.0641244        0.00355286    
     0.700000           1.00000         0.0400443        0.00619904    
      1.00000           1.54000         0.0524293        0.00403872    
      1.54000           2.40000         0.0522401        0.00353065    
      2.40000           4.80000         0.0323011        0.00441590    
      4.80000           10.0000         0.0278036        0.00648345