thumb|right|Tephigram
thumb|right|Annotated tephigram
A tephigram is one of several Usually, temperature and dew point data from radiosondes are plotted on these diagrams to allow calculations of convective stability or convective available potential energy (CAPE). Other countries use similar thermodynamic diagrams for the same purpose; however, the details of their construction vary. In a tephigram, isotherms are straight and have a 45-degree inclination to the right, while isobars are horizontal and slightly curved. Dry adiabats are also straight and have a 45-degree inclination to the left, while moist adiabats are curved.