# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.120997         0.0222593    
     0.460000          0.700000          0.129359         0.0113908    
     0.700000           1.00000          0.139946        0.00534488    
      1.00000           1.54000          0.147082        0.00266254    
      1.54000           2.40000          0.140071        0.00237318    
      2.40000           4.80000          0.138696        0.00245658    
      4.80000           10.0000          0.135259        0.00355816