# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0204738        0.00497045    
     0.460000          0.700000         0.0211572        0.00492751    
     0.700000           1.54000        0.00860656        0.00474741    
      1.54000           2.40000         0.0106694        0.00894037    
      2.40000           4.80000         0.0135524         0.0108122    
      4.80000           10.0000         0.0313857         0.0134510