# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0136452        0.00205548    
     0.460000          0.700000         0.0350835        0.00193269    
     0.700000           1.00000         0.0606203        0.00205042    
      1.00000           1.54000         0.0899261        0.00242866    
      1.54000           2.40000          0.110889        0.00308618    
      2.40000           4.80000          0.100492        0.00391425    
      4.80000           10.0000         0.0774088        0.00739502