We conclude the survey of map projections with the Eckert VI projection
(-JK), one of several projections used for global thematic maps; it
is an equal-area projection whose syntax is
-JK
lon0/width
where lon0 is the central meridian (which takes precedence over the mid-value implied by the -R setting). A simple world map is thus generated by
pscoast -R0/360/-90/90 -JK180/9i -B60g30/30g15 -Dc -A5000 -G180/120/60 \ -S100/180/255 -W0.25p >! map.ps