# Anatomy of A Plot

    Trick plots multiple plots on a "page" and multiple curves on a "plot".
    A "page" may have a number of plots and a "plot" may have a number of curves.

    In plots:
         Each plot has one or more curves.

    In curves:
         A curve has to be in a plot.
         Each curve has exactly one X variable and one Y variable.
         Or each curve may have one or more varcase (pair of X and Y variables).
         Each varcase has exactly one X variable and one Y variable.
         When a curve already has a variable, it can't add varcase.
         When a curve already has a varcase, it can't add a variable.
              In this case, the variable has to be added in the contained varcase.
         Variables have their own attributes such as unit, scale factor, line style, etc.

    In varcase:
         A varcase is used to indicate that two or more variable names mean the same thing.
         If the data for a curve can't be found for the first name, try the second and so forth.

    Settings for page, plot and variables are accessed within the property notebook on the bottom right.
    A DP spec may have multiple "pages".