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MODEX.....Option flags stored in the low-order bits of the integer
value. These are selected by adding one or more of the
following option values, and then setting the sign of the
resulting sum to select numbering and titling above (+) or
below (-) the axis.
1 - Number the axis. Even values of MODE suppress
numbering, but still affect the choice of tick mark
spacing.
2 - Numbering perpendicular (i.e. rotated -90 degrees) to
the axis; otherwise it is parallel to the axis.
4 - Omit the first number along the axis. This can be
useful to prevent text overlap when more than one axis
is drawn from a point.
8 - Omit the last number along the axis.
16 - Omit any zero number along the axis. This can be useful
for drawing axes intersecting at the origin.
Any value outside the legal range -31..+31 will raise an
error condition. The usual choice for a numbered left
vertical (Y) axis will be MODE = +3, and for a numbered lower
horizontal (X) axis will be MODE = -1. The usual choice for
an unnumbered right vertical axis will be MODE = +2 or -2,
and for an unnumbered upper horizontal axis will be MODE = 0.
The sizes and positions of number labels, even if they are
not drawn, affect the choice of where longer tick marks are
drawn. In the common case where the four sides of a graph
have axes, but two are unnumbered, for the unnumbered axes,
simply subtract 1 from the unsigned MODE value used for the
opposite numbered axis.