# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0168164        0.00858574    
     0.460000          0.700000         0.0368516        0.00519376    
     0.700000           1.00000         0.0420314        0.00646208    
      1.00000           1.54000         0.0486996        0.00759883    
      1.54000           2.40000         0.0545243         0.0110409    
      2.40000           4.80000         0.0616097         0.0133058    
      4.80000           10.0000         0.0701119         0.0248598