The plotms tool pm is the suite of functions underlying the plotms task. plotms is a task for plotting and interacting with visibility data. A variety of axes choices (including data column) along with MS selection and averaging options are provided. Flag extension parameters are also available for flagging operations in the plotter. 

The most common use of plotms is at the task level (details in the Global Task List page), but it is possible to access the pm tool directly, using set functions. See the Methods tab for available functions and the Examples tab for a plot using the tool interface.