# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0833622        0.00395196    
     0.460000          0.700000         0.0825627        0.00332662    
     0.700000           1.00000         0.0825469        0.00327071    
      1.00000           1.54000         0.0806659        0.00334387    
      1.54000           2.40000         0.0713443        0.00389343    
      2.40000           4.80000         0.0708632        0.00448892    
      4.80000           10.0000         0.0578444        0.00643286