HP 48g Graphing Calculator - Manual (Page 342)

Example: Assume PICT is its default size, shown in figure (a)
below.
To double the x range of PICT in the horizontal
direction and keep the same scales (units per pixel), enter
< ” 1 5 - i ) and < 5 2 ) and press P D I M . {PICT
becomes wide by #64 high in pixel units.) If you
redraw the graph, the effect is to add more points to the
graph at both ends, shown in figure (c).
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24-4 Advanced Plot Options