# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0218731        0.00813392    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000         0.0128248        0.00890438    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000         0.0106250         0.0102668    
      2.40000           4.80000         0.0238990        0.00363619    
      4.80000           10.0000         0.0155055        0.00357305