# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0838806        0.00680339    
     0.460000          0.700000         0.0845243        0.00736235    
     0.700000           1.00000         0.0856157        0.00781679    
      1.00000           1.54000         0.0690981        0.00924985    
      1.54000           2.40000         0.0822106         0.0121808    
      2.40000           10.0000         0.0360069         0.0185446