# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0459840        0.00842988    
     0.460000          0.700000         0.0428645         0.0100688    
     0.700000           1.00000         0.0272908         0.0122530    
      1.00000           1.54000         0.0421280         0.0198591    
      1.54000           2.40000        0.00191696         0.0443377    
      2.40000           10.0000         0.0525943         0.0390711