# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0152681        0.00945334    
     0.460000          0.700000        0.00659988        0.00932262    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000        0.00256650         0.0124837    
      1.54000           2.40000         0.0303068        0.00866351    
      2.40000           4.80000         0.0275563         0.0105356    
      4.80000           10.0000              -NaN              -NaN