# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.124482         0.0599138    
     0.460000          0.700000         0.0821309         0.0262737    
     0.700000           1.00000          0.113804        0.00833840    
      1.00000           1.54000          0.111895        0.00391685    
      1.54000           2.40000          0.100286        0.00338957    
      2.40000           4.80000         0.0927517        0.00365094    
      4.80000           10.0000         0.0841111        0.00509154