The plot/splot commands have an additional field to specify how to extract information from the input lattice. The special filenames Data and Coord refer to the data portion and the coordinate portion of the lattice. For example.
plot "Data" splot "Coord" with linesDefault X Resources:
gnuplot.foreground: black gnuplot.background: grey gnuplot.fontList: 7x13
Port: Input
Type: Lattice
Optional: This port is optional
Input Lattice
Port: Window
Type: Drawing Area
X drawing area for plot
Port: Command
Type: Text
Enter the current command to gnuplot.
Port: Port
Type: Option Menu
Menu Item: Geometry
Menu Item: X Window
Port: geo
Type: Geometry
Output of geometry if applicable