GULF4PLOT is the jGraph module of jLab.

 GULF4PLOT  A four-panel circulation plot for the Gulf of Mexico.
 
    GULF4PLOT(LAT,LON,CV) makes a four-panel quiver plot in the Gulf of
    Mexico with color shading being the speed of the mean flow.  CV is the 
    complex-valued velocity U+iV of size LENGTH(LAT) x LENGTH(LON) x 4.
 
    The plot has 2 rows and 2 columns, with a single colorbar centered 
    beneath the four plots.  
 
    GULF4PLOT(LAT,LON,CV,X) instead uses X, of the same size as CV, for the
    color shading.
 
    GULF4PLOT(...,CAX) uses CAX, a length 2 array, for the color axis.
 
    GULF4PLOT(...,CAX,CLABEL,LABELS), where LABELS is a cell array of four
    strings, prints LABELS{i} after the letter label of the ith subplot. 
 
    LAT, LON, CV, and X can also be cell arrays of four elements.  This is
    useful if the grid size is not the same in all four plots.
 
    Usage: h=gulf4plot(lat,lon,cv);
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    This is part of JLAB --- type 'help jlab' for more information
    (C) 2020 J.M. Lilly --- type 'help jlab_license' for details