The template transformation allows rapid straight line plotting of fluid-bearing reactions for conditions exceeding the two phase field in water-carbon dioxide. The system CaO--MgO--SiO2---H~O--C02 with the six solid phases talc, tremolite, quartz, magnesite, calcite, and dolomite is treated at 2Kb. These phases, in T--NH~O space at constant pressure, participate in two invariant points and eight reactions. Published T--NH20 data for three of these reactions at 2Kb are transformed using the template into LnK--1/T space to yield the parameters of the best (by eye) straight lines. The parameters of the other five reaction lines are derived by linear combination of these parameters.
The reactions belonging to one invariant point in T NH~O space will be straight lines that intersect at a single point in lnK--1/T space. This point is not the transformation of the invariant point, and it occurs because of the linear relationship between the reactions.
Errors need to be considered in transforming the system back into T NH20 space, especially when reaction lines with shallow slopes are involved.