S-values
From Glossary of Meteorology
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S-values
Specific temperature anomalies given by the relation where T is the actual temperature and Tp is the standard-atmosphere temperature at a point where the pressure altitude is zp.
S-values are usually expressed in terms of tenths of degrees per hundred degrees absolute temperature. S-value lines are drawn on 4D charts because they are related to D-values by where ΔvD is the variation in D-value for a given Δzp variation in pressure altitude.
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