# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.326350        0.00435773    
     0.460000          0.700000          0.334122        0.00392554    
     0.700000           1.00000          0.396609        0.00450611    
      1.00000           1.54000          0.570952        0.00861142    
      1.54000           2.40000          0.562444         0.0142370    
      2.40000           4.80000          0.468994         0.0191201    
      4.80000           10.0000          0.329635         0.0431362