2.15 lines

The `lines` style connects adjacent points with straight line segments. It may be used in either 2D or 3D plots. The basic form requires 1, 2, or 3 columns of input data. Additional input columns may be used to provide information such as variable line color (see `rgbcolor variable`).

2D form

          1 column:   y       # implicit x from row number
          2 columns:  x  y

3D form

          1 column:   z       # implicit x from row, y from index
          3 columns:  x  y  z
     

See also `linetype`, `linewidth`, and `linestyle`.