# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.203551          0.158379    
     0.460000           1.54000          0.122538         0.0714945    
      1.54000           2.40000          0.691015         0.0433921    
      2.40000           4.80000          0.419077         0.0218754    
      4.80000           10.0000          0.282766         0.0206423