# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.174279        0.00270967    
     0.460000          0.700000          0.174993        0.00308974    
     0.700000           1.00000          0.175670        0.00379092    
      1.00000           1.54000          0.172203        0.00468179    
      1.54000           2.40000          0.178625        0.00667498    
      2.40000           4.80000          0.181076         0.0110688    
      4.80000           10.0000          0.188733         0.0184107