# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0122300        0.00649151    
     0.460000           1.00000         0.0188305        0.00544939    
      1.00000           1.54000         0.0531480        0.00680268    
      1.54000           2.40000         0.0531494        0.00410981    
      2.40000           4.80000         0.0396643        0.00265663    
      4.80000           10.0000         0.0280355        0.00234631