[gradsusr] Draw a track

[T. haghroosta]

Dear All,
 
I would like to draw the track of a typhoon by grads, but I don't know how. Can anyone help me to do that? I tried some comments but it was unsuccessful. 
 
I am looking forward to hearing from side of you.
 
Regards,
Mojgan 
 		 	   		  
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