# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.139940        0.00593204    
     0.460000          0.700000          0.163897        0.00704603    
     0.700000           1.00000          0.123604        0.00974395    
      1.00000           1.54000          0.159131         0.0117201    
      1.54000           2.40000          0.195422         0.0135435    
      2.40000           4.80000          0.201745         0.0133864    
      4.80000           10.0000          0.180604         0.0123104