# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0234375         0.0135674    
     0.460000          0.700000         0.0538348        0.00986521    
     0.700000           1.00000         0.0872533        0.00594007    
      1.00000           1.54000          0.109552        0.00224906    
      1.54000           2.40000          0.119467        0.00152404    
      2.40000           4.80000          0.126760        0.00134695    
      4.80000           10.0000          0.118430        0.00174000