n.the best (most expensive) in a given line of merchandise

Top of the 'Line'
Top of the Line.
Top of the line
Mechanistic Model for the Prediction of Top-of-the-Line Corrosion Risk
Laptop-sized echocardiography machine versus full-sized top-of-the-line machine: a comparative study.
A Mechanistic Model of Top of the Line Corrosion
SemiEmpirical Model for Prediction of the Top of the Line Corrosion Risk
Top of the Line Corrosion in Multiphase Gas Lines: A Case History
Top of the Line Corrosion in Presence of Acetic Acid and Carbon Dioxide
Sour Top-of-the-Line Corrosion in the Presence of Acetic Acid
CO2 TOP OF THE LINE CORROSION IN THE PRESENCE OF H2S
CO2 Top of the Line Corrosion In Presence of Acetic Acid A Parametric Study
Effect of Acetic Acid, pH and MEG on the CO2 Top of the Line Corrosion