# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0730203        0.00239998    
     0.460000          0.700000         0.0802627        0.00245132    
     0.700000           1.00000         0.0855612        0.00279935    
      1.00000           1.54000         0.0875266        0.00324871    
      1.54000           2.40000         0.0858382        0.00422932    
      2.40000           4.80000         0.0864093        0.00601116    
      4.80000           10.0000         0.0883509         0.0101048