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determines the position (in the X and Y vectors) for the adding of text to an interaction plot
getPos.fnc(vec, pos)
an integer specifying position in vector for X and Y values in plot
vector of Y values
can be '"beg"', '"mid"', '"end"'
R. H. Baayen
not intended for independent use
See Also as plotLMER.fnc
plotLMER.fnc