Question: Maple 11 pointplot of two vectors

I'm trying to pointplot two arrays (vectors) but no matter what I change in the listing below Maple 11 keeps considering the second vector as an option.

> restart; with(stats[fit]); with(CurveFitting); with(ImageTools); with(plottools); with(Statistics); with(LinearAlgebra); with(plots); with(VectorCalculus); with(linalg);
> Rd := Vector([389.33, 453.33, 511.33, 557.33]); Ru := Vector([390.3463, 460.6926, 531.0390, 601.3853]);
p1 := pointplot(Rd, Ru);
Error, (in plots/pointplot) bad optional argument Array(1..4, {(1) = 390.3463, (2) = 460.6926, (3) = 531.0390, (4) = 601.3853})

I don't know what I'm missing or doing wrong.

Thanks in advance

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