# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.103252        0.00702962    
     0.460000          0.700000          0.134707        0.00526712    
     0.700000           1.00000          0.119609        0.00522909    
      1.00000           1.54000          0.116305        0.00517940    
      1.54000           2.40000          0.109215        0.00681116    
      2.40000           4.80000          0.101891        0.00812587    
      4.80000           10.0000          0.101259         0.0123012