Table 7: Year-averaged radial velocity of the blue and red bumps derived from the difference H$\beta $ and H$\alpha $ profiles.
Year H$\beta $ radial velocity (km s-1) H$\alpha $ radial velocity (km s-1)
  $V_{\rm b}$ $V_{\rm r1}$ $V_{\rm r2}$ $V_{\rm b1}$ $V_{\rm r1}$ $V_{\rm r2}$
1996 $-906\pm 131$ $+1461\pm 56$   $-1200\pm 69$ $+1379\pm 103$  
1997 $-833\pm 185$ $+1216\pm 164$   $-696\pm 32$ $+1079\pm 64$  
1998 $-994\pm 91$ $+1137\pm 103$   $-1075\pm 67$ $+1026\pm 71$  
1999 $-704\pm 200$ $+838\pm 155$   $-944\pm 135 $ $+764\pm 119$  
2000 $-544\pm 134$ +817: $+2863\pm 262$ $ -775\pm 192$ +800: $+2787\pm 261$
2001 $-704\pm 316$ +954: $+2707\pm 70$ $ -1043\pm 172$ +800: $+2526\pm 92$
2002 $-938\pm 394$ +674: $+1898\pm 200$ $ -1158\pm 144$ +584: $+1708\pm 191$


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