# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.346973        0.00786061    
     0.460000          0.700000          0.368298        0.00782980    
     0.700000           1.00000          0.399260        0.00925859    
      1.00000           1.54000          0.517905         0.0137843    
      1.54000           2.40000          0.497318         0.0237924    
      2.40000           4.80000          0.530142         0.0339169    
      4.80000           10.0000          0.400755         0.0765748