# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000         0.0331662         0.0231180    
      1.00000           1.54000        0.00213606         0.0299176    
      1.54000           2.40000         0.0230023         0.0124117    
      2.40000           4.80000         0.0263407        0.00718780    
      4.80000           10.0000        0.00837839         0.0127022