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Morsy et al . (1997) š¸É¡ªnµ³¨°Áª¨µ„µ¦„n°˜´ª ¨³‡ªµ¤¨³Á°¸¥— °Š—·œ µªÂž¦n ª¥Ä®o°´—˜´ªÂœnœÁ°ŠÅ—o (Melo
and Carneiro, 2010) œ°„‹µ„œ¸Ê „µ¦Á¨º°„°´˜¦µnªœœÊε˜n°ª´ —»ž¦³µœš¸É 0.4 ŤnšÎ µÄ®o˜nµŠÅž‹µ„°´˜¦µnªœœÊε˜n°
ª´ —»ž¦³µœš¸É š¸É 0.3 (Ramlochan et al ., 2000; Khatib, 2008) ˜n„¨´nª¥¨—ᦊĜÁœºÊ °Á¡˜rŗo—¸„ªn µš¸É°´˜¦µnªœ
œÊÎ µ˜n°ª´ —»ž¦³µœÁšnµ„´ 0.5 (Khatib and Wild, 1996; Khatib and Hibbert, 2005)