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lc variable tells the program to use the value read from one column of the input data as a linetype index, and use the color belonging to that linetype. This requires a corresponding additional column in the using specifier. Text colors can be set similarly using tc variable.
Examples:
# Use the third column of data to assign colors to individual points plot 'data' using 1:2:3 with points lc variable
# A single data file may contain multiple sets of data, separated by two # blank lines. Each data set is assigned as index value (see `index`) # that can be retrieved via the `using` specifier `column(-2)`. # See `pseudocolumns`. This example uses to value in column -2 to # draw each data set in a different line color. plot 'data' using 1:2:(column(-2)) with lines lc variable