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In 1958, Golay proposed a modified relationship reserved for capillary columns used in gas chromatography:

(1.39)

Equation (1.39) leads to the minimum value of HETP for a column of radius r, if the retention factor of the test compound is known. The coating efficiency can then be calculated as the ratio between the value found and that deduced from the efficiency (H = L/N) obtained from the chromatogram, multiplied by 100.

(1.40)