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another clue: the problem appear to be with Sage's interface to R since when I run the notebook in the pure R mode and alter the syntax of the latter comment above I don't get an error ( even though it looks like I got 0 rows in my table since I apparently need to inform R where my EOL's are ):

read.table(header=TRUE, text = "a b 1 2 3 4")

[1] a b X1 X2 X3 X4 <0 rows> (or 0-length row.names)