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           Compute a 2-D image with the density of points
       from 2 columns of an input table. Also create a table
       containing only the "isolated" points, those with a
       density below some threshold.

       The task is used by the  "plot-triangle.greg" procedure
       to display correlation analysis of N parameters, from a
       M x N table containing M valid samples of the N parameters.

Gildas manager 2020-07-04