| [1] Phipps Morgan (1997) Schilling (1991),  
        Feighner et al. (1995), Steinberger (2000),  Davies (1988), de Voogd 
        et al. (1999). [2] Anderson (1998a, 
                          1998b, 
                          1999, 2000a,b, 2001), Ozima (1994), Graham (2002), Moreira 
                          et al. (1999), Hilton et al. (1999). [3] Gu et al. (2003), Dziewonski (2000), Ritsema & 
        van Heijst (2000), Grand (1994), Gu et al. (2001, 2003), Dziewonski (2000), 
        Ritsema & van Heijst (2000), Ritsema & Allen (2003), Grand (1994), 
        Katzman et al. (1998), King & Ritsema (2000), Boschi & Dziewonski 
        (1999), Best et al. (1975), Anderson et al. (1992a, 1992b), Ritsema et 
        al. (1999), Sipkin & Jordan (1975). [4] Dieu et al. (2002), de Voogd et al. (1999), Christianson 
        et al. (2002), Natland (1980), McNutt et al. (1997), Dickinson (1998), 
        Humphreys et al. (2003), Favela & Anderson (1999), Natland (1980), 
        Burke (1996), Koppers et al. (2001), Wessel & Kroenke (1997), Natland 
        & Winterer (2004), McNutt & Bonneville (2000), Clouard & Bonneville 
        (2001). [5] Gu et al. (2001, 2003), Dziewonski (2000), Ritsema 
        & van Heijst (2000), Ritsema & Allen (2003), Grand (1994), Bijwaard 
        & Spakman (1999), Inoue et al. (1990), Zhou (1996), Fukao et al. (1992,  
        2001), Bijwaard et al. (1998), Montelli et al. (2003), Nataf (2000), Best 
        et al. (1975), Anderson et al. (1992a, 1992b), Ritsema et al. (1999), 
        Katzman et al. (1998), Boschi & Dziewonski (1999), Keller et al. (2000),  
        Sipkin & Jordan (1975), Foulger & Pearson (2001), Christiansen 
        et al. (2002), Zhao (2001). [6] Bijwaard & Spakman (1999), Inoue et al. (1990), 
        Zhou (1996), Fukao et al. (2001), Bijwaard et al. (1998), Montelli et 
        al. (2003, 2004), Nataf (2000), Fukao et al. (1992, 2001), Bijwaard et 
        al. (1998), Keller et al. (2000), Foulger & Pearson (2001), Christiansen 
        et al. (2002). 
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        the Table 
         
                            
         
                            
         
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