JPCOLOR is the jGraph module of jLab.

 JPCOLOR  Modified version of PCOLOR appropriate for cell-centered grids.
    JPCOLOR(XMID,YMID,Z) makes a PCOLOR plot with XMID and YMID marking the
    *centers* of the cells of Z.  X and Y need to be monotonic, but do not 
    need to have uniform spacing.
    This is unlike PCOLOR(X,Y,Z), where X and Y mark the cell *edges*.  
    Similarly, unlike PCOLOR, JPCOLOR does not throw away the last row and
    column of Z.
    JPCOLOR also automatically applies SQUEEZE to Z, which is useful for 
    working with slices of multidimensional datasets.
    The default shading for JPCOLOR is FLAT rather than FACETED.  JPCOLOR
    also sets the level of the PCOLOR image to the back of the plot.
    'jpcolor --f' generates a figure showing the differences from PCOLOR.
    Usage: jpcolor(x,y,z);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2014--2017 J.M. Lilly --- type 'help jlab_license' for details

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