NOCONTOURS is the jGraph module of jLab.

 NOCONTOURS  Removes contours from a CONTOURF plot.
 
    NOCONTOURS(H) where H is an array of handles to lines, output by
    CONTOURF, sets the linestyle for all the lines to 'none'.  This
    removes the contours from the CONTOURF plot.
 
    NOCONTOURS with no input arguments sets the linestyle of all patch
    objects (for Matlab versions < 2014b) or all contour objects (for 
    versions 2014b and later) in the current axes to 'none'.
 
    H=NOCONTOURS also returns the handles to the objects.  
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    This is part of JLAB --- type 'help jlab' for more information
    (C) 2009--2015 J.M. Lilly --- type 'help jlab_license' for details