Here are GZip minimally compressed source-code sizes after removal of comments and removal of duplicate whitespace characters -

    Benchmark   GZ Bytes    Factor  (wc -l Factor from paper)
    Java Pro    5198        1.65x   1.9x
    Java        4403        1.40x   1.6x
    C++         4229        1.34x   1.3x
    Go          3768        1.20x   1.4x
    Go Pro      3259        1.03x   1.2x
    Scala       3138        ====    ===
    Python      2755        0.87x   ????
    Scala Pro   1929        0.61x   0.5x