# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0502410        0.00603787    
     0.460000          0.700000         0.0418622        0.00593329    
     0.700000           1.00000         0.0254364        0.00904958    
      1.00000           1.54000         0.0267674        0.00763736    
      1.54000           2.40000         0.0309444        0.00884041    
      2.40000           10.0000         0.0252897        0.00754841