# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0165603        0.00933013    
     0.460000          0.700000         0.0367239        0.00597073    
     0.700000           1.00000         0.0383386        0.00750504    
      1.00000           1.54000         0.0466562        0.00901170    
      1.54000           2.40000         0.0296032         0.0135389    
      2.40000           10.0000         0.0484044         0.0152417