# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.208282        0.00862275    
     0.460000          0.700000          0.229819        0.00802171    
     0.700000           1.00000          0.239577        0.00770175    
      1.00000           1.54000          0.262025        0.00896647    
      1.54000           2.40000          0.268719         0.0118452    
      2.40000           4.80000          0.252586         0.0149206    
      4.80000           10.0000          0.218872         0.0274584