For the triangle plots , the elements
in the triangulation are
colored to depict some feature of the mesh.
The available options are controlled by the switch
INPLSW
as summarized in Table 
.
If INPLSW=0, the elements in the mesh are colored according to the
user supplied labels in ITNODE(4,I); all elements with the same label
will have the same color.
For 
, INPLT colors the elements of the
triangulation according to their quality,
measured by q(t) in
() (INPLSW=1), their largest angle (INPLSW=2),
and their smallest angle (INPLSW=3).
For each of the three measures,
five numbers are printed in the upper right legend.
The row labeled ``average'' refers to the average of
that quantity over all elements in the mesh;
``worst'' reports the smallest value of q(t),
largest angle, or smallest angle of all elements.
The rows labeled ``good'', ``fair'', and ``poor'' report
the percentage of elements in each category and depict the corresponding colors.
Some examples are shown in Figures and
.
For q(t), good means 
, fair means
,
and poor means q(t) < .6.
For large angles, good means 
,
fair means 
,
and poor means 
(A(t) is the largest angle).
For small angles, good means 
,
fair means 
and
poor means 
(a(t) is the smallest angle).
Triangles that are good in terms of q(t) are
(necessarily) also good in terms of large and
small angles.
Those that are fair in terms of q(t) must be
good or fair in terms of large and small angles
(but not conversely).
The meanings and use of RMAG ,
CENX ,
CENY ,
and MXCOLR are identical to
TRIPLT. Labeling options using
NUMBRS
are summarized in Table .
INPLT was used with various NUMBRS options to produce
Figure
although the legends on the right hand sides of the pictures were deleted.
For the main graph, three line-drawing options are available
using LINES, as summarized in Table .