gsn_add_polyline

I upload the scripts. I want to produce amap with 9 undefined dottedlines on the China map.
you can see:
yp(:) = (/24.183,21.700,18.421,15.000,11.486,7.500,3.850,4.028,6.801,11.892,15.789/)
   xp(:) = (/122.887,121.950,119.737,119.125,118.780,115.909,112.267,108.636,108.140,110.375,109.490/)
 
i want it to show 9 dotted lines not 11 or other number. I delete some point but it still does not turn out 9 lines.
how can i write the command to control it ?
hope for your help

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