##### 15.4.6.4 Contour Groups

Contour group objects are created by the `contour`, `contourf` and `contour3` functions. The are equally one of the handles returned by the `surfc` and `meshc` functions. The properties of the contour group are

`contourmatrix`
  A read only property that contains the data return by `contourc` used to create the contours of the plot.
`fill`
  A radio property that can have the values "on" or "off" that flags whether the contours to plot are to be filled.
`zlevelmode`
`zlevel`
  The radio property `zlevelmode` can have the values "none", "auto" or "manual". When its value is "none" there is no z component to the plotted contours. When its value is "auto" the z value of the plotted contours is at the same value as the contour itself. If the value is "manual", then the z value at which to plot the contour is determined by the `zlevel` property.
`levellistmode`
`levellist`
`levelstepmode`
`levelstep`
  If `levellistmode` is "manual", then the levels at which to plot the contours is determined by `levellist`. If `levellistmode` is set to "auto", then the distance between contours is determined by `levelstep`. If both `levellistmode` and `levelstepmode` are set to "auto", then there are assumed to be 10 equal spaced contours.
`textlistmode`
`textlist`
`textstepmode`
`textstep`
  If `textlistmode` is "manual", then the labeled contours is determined by `textlist`. If `textlistmode` is set to "auto", then the distance between labeled contours is determined by `textstep`. If both `textlistmode` and `textstepmode` are set to "auto", then there are assumed to be 10 equal spaced labeled contours.
`showtext`
  Flag whether the contour labels are shown or not.
`labelspacing`
  The distance between labels on a single contour in points.
`linewidth`
`linestyle`
`linecolor`
  The properties of the contour lines. The properties `linewidth` and `linestyle` are similar to the corresponding properties for lines. The property `linecolor` is a color property (see Colors), that can also have the values of "none" or "auto". If `linecolor` is "none", then no contour line is drawn. If `linecolor` is "auto" then the line color is determined by the colormap.
`xdata`
`ydata`
`zdata`
  The original x, y, and z data of the contour lines.
`xdatasource`
`ydatasource`
`zdatasource`
  Data source variables.