# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.170521        0.00766853    
     0.460000          0.700000          0.176525        0.00835494    
     0.700000           1.00000          0.208775         0.0111498    
      1.00000           1.54000          0.237384         0.0161322    
      1.54000           2.40000          0.186215         0.0167630    
      2.40000           4.80000          0.170474         0.0214746    
      4.80000           10.0000          0.150470         0.0368439