The GRAPHTYPE attribute is used in conjunction with the GRAPHSTYLE atrtibute in order to determine exactly how to draw the graph.

For each GRAPHTYPE, there is a set of applicable GRAPHSTYLE values thus...

Area (2D)
0 Stacked (default)
1 Absolute
2 Stacked percentage
3 Stacked semi-logarithmic
4 Absolute semi-logarithmic

Area (3D)
0 Stacked (default)
1 Absolute
2 Stacked percentage

Bar (2D)
0 Vertical bars, clustered if multiple data sets (default)
1 Horizontal
2 Stacked
3 Horizontal stacked
4 Stacked percentage
5 Horizontal stacked percentage
8 Vertical stacked floating
9 Horizontal stacked floating
Note: Floating bars require more than one data set. The first data set in a floating bar graph is invisible. The missing bottom element of the stacked bar makes the bar appear to be suspended above the X axis, hence the name "floating" bar graph.
10 Vertical Pareto
11 Horizontal Pareto
Note: With a Pareto graph, bars are sorted in descending order; any attached user-defined X axis labels are sorted with the data. If there is more than one data set, bars are sorted in groups such that the first data set appears in descending order.

Bar (3D)
As for 2D bar, plus:
6 Z-clustered
7 Horizontal Z-clustered

Box-whisker
0 Raw data, samples drawn (default)
1 Raw data, no samples drawn
2 Parametric data

The following values may be added to settings 0-2 and may be used in combination. For example, to produce a graph with parametric data, no notch and a black border, the setting would be:

Graph1.GraphStyle = 2 + 4 + 32

+4 No notch
+8 No whisker
+16 No median line
+32 Black border

Note: Median lines are visible with the black border option and when the marker's fill pattern is non-solid.

Bubble
No style options

Candlestick
No style options

Gantt
0 Adjacent bars (default)
1 Spaced bars

High-low-close and open-high-low-close
0 Open (if used), high, low, and close bars (default)
1 No open or close bars
2 No high or low bars
3 No bars of any kind

Line, log/lin, lin/log, and log/log
0 Lines only (default)
1 Symbols
2 Sticks between points and Y origin
3 Sticks and symbols
4 Lines
5 Lines and symbols
6 Lines and sticks
7 Lines, sticks, and symbols

Pie (2D/3D)
0 Lines join labels to pie (default)
1 No label lines
2 Colored labels
3 Colored labels without lines
4 Percentage labels
5 Percentage labels without lines
6 Colored percentage labels
7 Colored percentage labels without lines

Polar
0 Lines only (default)
1 Symbols
2 Sticks between points and origin (center)
3 Sticks and symbols
4 Lines
5 Lines and symbols
6 Lines and sticks
7 Lines, sticks, and symbols

Scatter (2D)
0 Symbols only (default)
1 Curve only
2 Symbols only
3 Curve and symbols

Scatter (3D)
0 Symbols only (default)
1 Vertical sticks and symbols
2 Symbols and lines between points
3 Symbols, vertical sticks, and lines between points

Surface
0 Filled panels and boundary lines (default)
1 Boundary lines only
2 Filled panels only
3 Filled panels and boundary lines with side wall
4 Boundary lines only with side wall
5 Filled panels only with side wall

Tape
No style options