# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0212815         0.0587587    
     0.460000           1.54000        0.00887202         0.0145502    
      1.54000           2.40000         0.0254817        0.00462875    
      2.40000           4.80000         0.0323615        0.00246236    
      4.80000           10.0000         0.0346316        0.00281943