# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0768208        0.00520303    
     0.460000          0.700000         0.0734061        0.00517355    
     0.700000           1.00000         0.0637197        0.00685997    
      1.00000           1.54000         0.0819589        0.00755327    
      1.54000           2.40000         0.0540165        0.00879451    
      2.40000           4.80000         0.0505937         0.0124063    
      4.80000           10.0000         0.0437794         0.0227561