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#### 15.4.6.4 Contour Groups

Contour group objects are created by the `contour`, `contourf`, and `contour3` functions. The are also 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.

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