# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.240904        0.00226317    
     0.460000          0.700000          0.247622        0.00223083    
     0.700000           1.00000          0.263680        0.00270540    
      1.00000           1.54000          0.245825        0.00295696    
      1.54000           2.40000          0.223441        0.00344357    
      2.40000           4.80000          0.187292        0.00418064    
      4.80000           10.0000          0.148239        0.00514840