# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0798443         0.0176486    
     0.460000          0.700000          0.151993         0.0134328    
     0.700000           1.00000          0.224533        0.00781695    
      1.00000           1.54000          0.301686        0.00379749    
      1.54000           2.40000          0.311128        0.00299996    
      2.40000           4.80000          0.299759        0.00321037    
      4.80000           10.0000          0.262993        0.00480187