# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0154559        0.00266982    
     0.460000          0.700000        0.00876287        0.00293117    
     0.700000           1.00000        0.00659613        0.00349613    
      1.00000           1.54000         0.0119900        0.00229359    
      1.54000           2.40000         0.0179351        0.00232022    
      2.40000           4.80000        0.00489173        0.00691725    
      4.80000           10.0000         0.0125740        0.00692871