Came across an interesting article — worth a read
Found this article while researching and it actually answered a lot of my questions <a href=http://geosungeng.co.kr/bbs/board.php?bo_table=sub6_3&wr_id=200938>http://geosungeng.co.kr/bbs/board.php?bo_table=sub6_3&wr_id=200938</a>
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