xyz2grd uses previous numbers instead of NaN?

Hi GMTers !

on GMT5.1.1 seems to miss some of the NaNs and holds colors that were read
in previous lines. I've used the same calls successfully on earlier
versions. in example.sh I have some long ascii vector written to a temp
file, and call xyz2grd. the result could be open with ncview, or grdimage.
the output of grdimage is attached as an eps. several black strokes can be
seen along the land area, and at the bottom one can see that the program
extend the ocean colors into land parts.

my guess : some default is assumed regarding the new options of -A ?

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