# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.294915        0.00456121    
     0.460000          0.700000          0.302512        0.00420870    
     0.700000           1.00000          0.210494        0.00684260    
      1.00000           1.54000          0.213902        0.00748362    
      1.54000           2.40000          0.286142        0.00878901    
      2.40000           4.80000          0.249681        0.00881267    
      4.80000           10.0000          0.209240         0.0106225