# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.116760         0.0422433    
     0.460000          0.700000         0.0859046         0.0212620    
     0.700000           1.00000         0.0723737        0.00763561    
      1.00000           1.54000         0.0624610        0.00360720    
      1.54000           2.40000         0.0561411        0.00320520    
      2.40000           4.80000         0.0498309        0.00352053    
      4.80000           10.0000         0.0530826        0.00543666