# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0454177        0.00630142    
     0.460000          0.700000         0.0651786        0.00647148    
     0.700000           1.00000         0.0771334        0.00735223    
      1.00000           1.54000         0.0524366        0.00750318    
      1.54000           2.40000         0.0697976        0.00885800    
      2.40000           4.80000         0.0761987         0.0126266    
      4.80000           10.0000         0.0411015         0.0179361