#### 1.17.1.2 linecolor variable

‘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