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SUBROUTINE PLTQF (IQ)
C$ (Quadrant Frame)
C$ It is sometimes desirable to display more than one view of
C$ a graph on a single plot frame. Quadrant plotting permits
C$ up to four such views. The standard paper size page is
C$ subdivided into four square quadrant viewports contained
C$ within an inner frame. Each viewport is oriented
C$ horizontally on the page, unless the device space
C$ corresponds to a vertical frame, in which case the quadrant
C$ frames are oriented vertically. The horizontal or vertical
C$ mode could have been selected by a previous call to PLTFR
C$ or PLTVF, respectively, or perhaps by an explicit call to
C$ SETDS2. No border is drawn around the viewport, so this
C$ routine will often be used for hidden-line plots.
C$
C$ The quadrant number, IQ, is an integer in the range 1..4
C$ selecting one of the quadrants. These are numbered in a
C$ counterclockwise direction starting in the upper right
C$ corner of the vertical frame. The unit square is assigned
C$ to the selected viewport, so that all subsequent plotting
C$ using the pen movement routines, PL2CA, PL2SP, etc. will
C$ operate correctly.
C$ (07-JUN-85)