# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.206734        0.00901069    
     0.460000          0.700000          0.300358        0.00662363    
     0.700000           1.00000          0.349488        0.00615661    
      1.00000           1.54000          0.670381        0.00457822    
      1.54000           2.40000          0.661893        0.00382785    
      2.40000           4.80000          0.453108        0.00320284    
      4.80000           10.0000          0.275185        0.00401869