# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0155275         0.0140141    
     0.460000          0.700000         0.0272322         0.0114224    
     0.700000           2.40000         0.0158563         0.0119293    
      2.40000           4.80000         0.0448820         0.0243423    
      4.80000           10.0000         0.0558861         0.0389369