15.58.23  3-d 

Mesh  data  produces a scatter plot if THREE is off and the dependent axis
is Z.  If the dependent axis is Y or X then a series of slices are plotted
of mesh data.  The scatter plot is truncated with zero dots for data equal
to ZMIN, and the maximum number of dots  at  ZMAX.   The  options  SYMBOL,
DOTS,  COUNTS,  NORANDOM, and VARIABLE are used to control the look of the
scatter plot.  In addition by setting the Z limits and using  the  LIMITED
option  you  can  control which data is plotted.  If the dependent axis is
not correct for the desired type of plot use the SWAP  command  to  change
them.

                                  Example
     TD:PLOT SYMBOL=1O SIZE=10 NORANDOM VARIABLE
Plots  the  selected  symbol  in  varying  sizes.   It is 1.0" at ZMAX and
nothing is plotted at ZMIN.
     TD:SET LIM ZMAX=4;  PLOT BLUE LIMITED
          or...
     TD:PLOT BLUE LIMITED TO Z=4
     TD:SET LIM ZMIN=4;  PLOT RED LIMITED
          or...
     TD:PLOT RED LIMITED FROM Z=4.0001
Points Z=4 and lower are plotted in BLUE.  Points above 4 are RED.

The default for PLOT is THREE off.