(1) There's something funny about the data that you present below.
At least in my mailer (Thunderbird) what looks like a space between
the X and Y values turns into a NULL character when I try to copy
and paste.
(2) Create a data frame, say "M" with the X and Y values as given
in your email.
(3
I have the following data from an image analysis program, in which the x and
y co-ordinates are locations of the centroids of shapes on a 2 dimensional
plot. The Y co-ordinates were positive, but I changed them to negative as
the resulting scatterplot was upside down (the image analysis program rea
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