R-beta: image axes

[Bill Simpson]

I am using image() with col=gray(31:0/31).  These are "reversed" grey
levels where black=biggest z-value. The problem is that the lines with
form a box around the plot are not all these.  Only the bottom and right
sides have lines; the others are missing.

I wonder if this is due to the white cells of my image plot slightly
overlapping with these lines and thereby wiping them out?

I tried adding bty = "o" to image() but it didn't do anything.

Thanks very much for any help.

Bill Simpson


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