Section: Handle-Based Graphics
contourmatrix - array - the matrix containing contour data
 for the plot.  This is a 2 x N matrix containing x and y coordinates
 for points on the contours.  In addition, each contour line starts with
 a column containing the number of points and the contour value.
 displayname - string - The name of this line series as it
    appears in a legend.
 floating - {'on','off'} - set to on to have floating (3D) contours
 levellist - vector - a vector of Z-values for the contours
 levellistmode - {'auto','manual'} - set to auto for 
    automatic selection  of Z-values of the contours.
 linecolor - color of the contour lines.
 linestyle - {'-','--',':','-.','none'} - the line style to draw the contour in.
 linewidth - scalar - the width of the lines
 parent - handle - The axis that contains this object
 tag - string - A string that can be used to tag the object.
 type - string - Returns the string 'contour'.
 userdata - array - Available to store any variable you
 want in the handle object.
 visible - {'on','off'} - Controls visibility of the the line.
 xdata - matrix - Contains the x coordinates of the 
 surface on which the zdata is defined.  This can either be a monotonic
 vector of the same number of columns as zdata, or a 2D matrix
 that is the same size as zdata.
 xdatamode - {'auto','manual'} - When set to 'auto' 
FreeMat will autogenerate the x coordinates for the contours.  
These values will be 1,..,N where N is the number of columns
of zdata.
 ydata - matrix - Contains the y coordinates of the
 surface on which the zdata is defined.  This can either be a monotonic
 vector of the same number of rows as zdata or a 2D matrix that is
 the same size as zdata.
 ydatamode - {'auto','manual'} - When set to 'auto' 
FreeMat will autogenerate the y coordinates for the contour data.
 zdata - matrix - The matrix of z values that are to
 be contoured.