3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7

- Example 3-1 Demonstration of contouring routine PGCONT using a 2-D Cartesian data array.

- Example 3-2 Demonstration of fast contouring routine PGCONS; this
routine may be unsuitable for plotting dotted or dashed lines and does not
work for pen plotters.

- Example 3-3 Demonstration of contouring routine PGCONT
with labels inserted on the contours by PGCONL.

- Example 3-4 Demonstration of contouring routine PGCONB (like PGCONS
but with some areas blanked out).

- Example 3-5 Demonstration of contouring routine PGCONX with arrow
labels. PGCONX can work in a non-Cartesian system as shown in the next
example, 3-6.

- Example 3-6 Demonstration of contouring on a non-Cartesian grid using
routine PGCONX.

- Example 3-7 Demonstration of contouring routine PGCONF which shades
the areas between contours.

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