# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000         0.0265218         0.0231199    
     0.700000           1.00000         0.0342794         0.0140389    
      1.00000           1.54000         0.0445965         0.0210257    
      1.54000           2.40000         0.0109487         0.0567028    
      2.40000           4.80000          0.130900        0.00843578    
      4.80000           10.0000         0.0997401        0.00578555