# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000        0.00573235        0.00578491    
     0.700000           1.00000        0.00310142         0.0103801    
      1.00000           1.54000         0.0103833        0.00640113    
      1.54000           2.40000         0.0103195        0.00809158    
      2.40000           4.80000         0.0178514        0.00867368    
      4.80000           10.0000         0.0324612         0.0110532