# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00499324        0.00432766    
     0.460000          0.700000        0.00653114        0.00370511    
     0.700000           1.00000         0.0102608        0.00421678    
      1.00000           4.80000        0.00367990        0.00279942    
      4.80000           10.0000        0.00864351        0.00796508