Preferred Label : field level; 
IUPAC definition : Logarithm of the ratio of two values of a field quantity, usually amplitude. Levels
               are expressed in different ways: LF   ln(F/F0).Np, where N p is the symbol for the
               unit neper coherent with the SI, or LF   20.log10(F/F0).dB, where dB is the symbol
               for the unit decibel.; 
         
         
            Origin ID : F02361; 
 See also See also
 
         
         
         Logarithm of the ratio of two values of a field quantity, usually amplitude. Levels
            are expressed in different ways: LF   ln(F/F0).Np, where N p is the symbol for the
            unit neper coherent with the SI, or LF   20.log10(F/F0).dB, where dB is the symbol
            for the unit decibel.