# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00403198        0.00433412    
     0.460000          0.700000        0.00889690        0.00432631    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000        0.00442201        0.00529472    
      2.40000           4.80000        0.00432982        0.00593816    
      4.80000           10.0000              -NaN              -NaN