# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0509807        0.00194521    
     0.460000          0.700000         0.0532576        0.00205362    
     0.700000           1.00000         0.0609732        0.00226935    
      1.00000           1.54000         0.0624106        0.00245017    
      1.54000           2.40000         0.0582987        0.00364585    
      2.40000           4.80000         0.0560176        0.00483229    
      4.80000           10.0000         0.0467393        0.00958749