# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0619573        0.00205998    
     0.460000          0.700000         0.0568363        0.00214103    
     0.700000           1.00000         0.0602810        0.00276882    
      1.00000           1.54000         0.0588514        0.00256186    
      1.54000           2.40000         0.0520940        0.00309279    
      2.40000           4.80000         0.0496497        0.00356503    
      4.80000           10.0000         0.0509666        0.00493918