# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.178773        0.00493520    
     0.460000          0.700000          0.160889        0.00381329    
     0.700000           1.00000          0.135949        0.00314877    
      1.00000           1.54000          0.120676        0.00231304    
      1.54000           2.40000          0.105078        0.00238481    
      2.40000           4.80000         0.0895221        0.00269829    
      4.80000           10.0000         0.0710566        0.00361555