# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.135154        0.00194394    
     0.460000          0.700000          0.120162        0.00188544    
     0.700000           1.00000          0.106487        0.00214276    
      1.00000           1.54000         0.0916593        0.00197904    
      1.54000           2.40000         0.0666879        0.00234188    
      2.40000           4.80000         0.0475797        0.00270055    
      4.80000           10.0000         0.0338645        0.00387968