X and Y axis scaling in both 2D and 3D graphs can be adjusted using the
mouse wheel. 4#4wheel-up5#5 scrolls up (increases both YMIN and YMAX by ten
percent of the Y range, and increases both Y2MIN and Y2MAX likewise), and
4#4wheel down5#5 scrolls down. 4#4shift-wheel-up5#5 scrolls left (decreases both
XMIN and XMAX, and both X2MIN and X2MAX), and 4#4shift-wheel-down5#5 scrolls
right. 4#4control-wheel-up5#5 zooms in toward the center of the plot, and
4#4control-wheel-down5#5 zooms out. 4#4shift-control-wheel-up5#5 zooms in along the
X and X2 axes only, and 4#4shift-control-wheel-down5#5 zooms out along the X and
X2 axes only.
