# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0628936        0.00308842    
     0.460000          0.700000         0.0601566        0.00202189    
     0.700000           1.00000         0.0552571        0.00173906    
      1.00000           1.54000         0.0497858        0.00152622    
      1.54000           2.40000         0.0443552        0.00173249    
      2.40000           4.80000         0.0430693        0.00213883    
      4.80000           10.0000         0.0366680        0.00279046