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The height equivalent to a theoretical plate H, as already defined (Eq. (1.4)), is calculated for reference compounds to permit a comparison of columns of different lengths. However, H does not behave as a constant; its value depends upon the compound chosen and upon the experimental conditions.

For a long time in gas chromatography, an adjustment value called the effective plate height H_eff was calculated using the true efficiency, instead of the theoretical efficiency.

The calculation of H_eff from the real efficiency uses Eq. (1.20):

(1.20)