scatterplot matrix question

Now that we are able to help with some more detailed view of your  
data
(although you could have helped helping by making it easier for us  
to import
your data into R), the answer is:

I am preparing for the data analysis, writing the code (knowing I may
have to modify it later) while the data are still being collected.
That's why I used the artificial data when asked for some. I will be
pressed for time when the data arrive.

Almost, after reshaping:



dwide <- reshape(d, v.names="resp", idvar="ID",
               timevar="angle", direction="wide")
pairs(dwide[,-1])

Thanks very much, Uwe. I will try this (on artificial data). I think
reshape() requires a library [reshape?].