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Hints

Buffer plot commands between bbuf/ebuf pairs for performance reasons, and to avoid excessive ``flicker.''
Have your code work both in colour and in black in white by using the qcol routine to determine how many colours are available (e.g., you can switch to a contour display from a raster display if there aren't enough colours).
When you set labelling sizes with sch, the units are 1/40th of the smaller x and y widths. If you send to a PostScript device the same commands that you send to a smaller window, the plot will look bad because although the characters are the same relative height, their absolute height is much too large. Conversely, line widths (slw) often look too thin on the PostScript plots.
Be careful if you put tk_hold and tk_release calls around PGPLOT calls. The PGPLOT calls will be processed immediately, whereas the other Tk commands are held up, including resizes. This might cause query commands to return shortly-to-be incorrect values.

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