# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0280498        0.00281783    
     0.460000          0.700000         0.0275432        0.00279263    
     0.700000           1.00000         0.0198505        0.00369630    
      1.00000           1.54000         0.0200658        0.00353392    
      1.54000           4.80000        0.00938843        0.00365615    
      4.80000           10.0000         0.0189696        0.00815717