key examples

This places the key at the default location:

      set key default

This places a key at a specific place (upper right) on the screen:

      set key at screen 0.85, 0.85

This places the key below the graph and minimizes the vertical space taken:

      set key below horizontal

This places the key in the bottom left corner of the plot, left-justifies the text, gives the key box a title at the top, and draws a box around it with a thick border:

      set key left bottom Left title 'Legend' box lw 3