# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.335558         0.0119633    
     0.460000          0.700000          0.323047         0.0113184    
     0.700000           1.00000          0.403951         0.0205037    
      1.00000           1.54000          0.545182         0.0384921    
      1.54000           2.40000          0.448158         0.0454707    
      2.40000           4.80000          0.270864         0.0477327    
      4.80000           10.0000          0.274449         0.0871555