# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00998215        0.00750903    
     0.460000          0.700000        0.00789212        0.00669686    
     0.700000           1.00000        0.00540266         0.0102261    
      1.00000           2.40000         0.0167209        0.00622034    
      2.40000           4.80000         0.0208006        0.00472981    
      4.80000           10.0000         0.0385255        0.00244321