Hi Hussen,
One trick (old, before the introduction of patterns in Ferret!) is to make a "transparent" mask using your significance values. Say we have variables "corr" and "sig_corr" which are on the same grid and we want to highlight values above "sigval" First method: Drop out values above the significance in a checkerboard fashion values below will be filled solidly. let masked_corr = if sig_corr lt `sigval` or mod(i+j,2) eq 1 then corr shade masked_corr Second method: Overlay with a checkerboard mask in monochrome. This works better if you need to use FILL for you underlying plot. ! Only consider locations above the significance level in checkerboard style. let mask = if sig_corr gt `sigval` and mod(i+j,2) eq 1 then 1 shade corr shade/ov/nolab/pal=black mask You can play around with the mod function to get a satisfactory effect. Maybe even regrid to a finer grid to alter the density. Cheers, Russ On 23/04/14 19:31, Hussen Seid wrote:
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