# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.649167         0.0158625    
     0.460000          0.700000          0.622716         0.0134486    
     0.700000           1.00000          0.580439         0.0158721    
      1.00000           1.54000          0.468688         0.0129986    
      1.54000           2.40000          0.366115         0.0114277    
      2.40000           4.80000          0.243754        0.00933045    
      4.80000           10.0000          0.190652        0.00896069