.measure Line

General Form:
measure analysis resultname point | interval [measurements] [postcmds]
measure analysis resultname param=expression [postcmds]

The .measure line allows one to identify a measurement point or interval, and to evaluate an expression at that point, or call a number of measurement primitives that apply during the interval, such as rise time or pulse width. There is also a measure command that uses the same syntax, but will apply to all circuits when active. See the description of that command for information about syntax and usage.