# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.157921        0.00273376    
     0.460000          0.700000          0.159962        0.00276599    
     0.700000           1.00000          0.159315        0.00327355    
      1.00000           1.54000          0.155939        0.00421521    
      1.54000           2.40000          0.158827        0.00637496    
      2.40000           4.80000          0.158845         0.0100070    
      4.80000           10.0000          0.127943         0.0176973