# Plate Theory and Extensions - Temperature Changes During the Passage of a Solute Through a Theoretical Plate in Gas Chromatography > Page 86

^{Now, }.

In addition,
(n) is large and the whole elution curve of a given solute is practically
contained between w = -_{} and w = _{} (*i.e*.,
contained within four standard deviations of the Gaussian curve) thus _{} will
always be very much greater than _{} and, thus, _{} and all
higher terms can be ignored with respect to _{}.

Thus, and substituting for in equation (73),

Thus, integrating
from (-_{}) to the point of measurement (w),

Now, as (n) is large when v=0, w=-n and q = 0 Thus, E=0, and