# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0155626        0.00709277    
     0.460000          0.700000         0.0205443        0.00538115    
     0.700000           2.40000        0.00459634        0.00614988    
      2.40000           4.80000         0.0537590        0.00398543    
      4.80000           10.0000         0.0550179        0.00245160