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It turns out that I was just adding and therefore displaying only 1 point. I had to change the code this part of the code.

 path = list()
for ii in xrange(20):
    loc = Pose()#moved in to for loop
    loc.position.x = ii
    loc.position.y = 2*ii  
    loc.position.z = 0
    path.append(loc)

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