spiderplot

The set spiderplot command switches interpretation of coordinates to a polar system in which each data point is mapped to a position along a radial axis. paxis 1 is always vertical; axes 2 to N proceed clockwise with even spacing. The command must be issued prior to plotting. It has additional effects equivalent to

     set style data spiderplot
     unset border
     unset tics
     set key noautotitle
     set size ratio 1.0

Use reset to restore these after plotting.