HP 50g Graphing Calculator - Manual (Page 420)

Page 12-37
Θ Press @EDIT L @LABEL @MENU to see the graph with labels and ranges. This
particular version of the graph is limited to the lower part of the display.
We can change the viewpoint to see a different version of the graph.
Θ Press LL@)PICT @CANCL to return to the PLOT WINDOW environment.
Θ Change the eye coordinate data to read :
XE:0 YE:-3 ZE:3
Θ Press @ERASE @DRAW to see the surface plot.
Θ Press @EDIT L @LABEL @MENU to see the graph with labels and ranges.
This version of the graph occupies more area in the display than the
previous one. We can change the viewpoint, once more, to see another
version of the graph.
Θ Press LL@)PICT @CANCL to return to the PLOT WINDOW environment.
Θ Change the eye coordinate data to read :
XE:3 YE:3 ZE:3
Θ Press @ERASE @DRAW to see the surface plot. This time the bulk of the plot is
located towards the right –hand side of the display.
Θ Press @CANCL to return to the PLOT WINDOW environment.
Θ Press $ , or L@@@OK@@@, to return to normal calculator display.