# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.203914        0.00422704    
     0.460000          0.700000          0.210001        0.00414480    
     0.700000           1.00000          0.190246        0.00424469    
      1.00000           1.54000          0.207557        0.00324175    
      1.54000           2.40000          0.189124        0.00373240    
      2.40000           4.80000          0.167949        0.00433808    
      4.80000           10.0000          0.124651        0.00470797