# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00898500        0.00325874    
     0.460000          0.700000        0.00792383        0.00369644    
     0.700000           1.00000         0.0122143        0.00419466    
      1.00000           2.40000        0.00607176        0.00353775    
      2.40000           4.80000         0.0130274        0.00731658    
      4.80000           10.0000         0.0224865        0.00874963