define viewport: setting the drawing size and location in window

cited from ferret
yes? use levitus_climatology                                  ! using levitus data (default)
yes? define viewport/xlim=0,0.8/ylim=0,1 my_view   ! defining new size and location of drawing as “my_view”
yes? set viewport my_view                                     ! selecting “my_view” as viewport
yes? shade temp[k=1]                                          ! drawing.
this function is useful for making some space for colorbar expression.
pic. 1. the result after applying “my_view”(left), original(right)

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