Hi everyone,

I'm having some difficulty replicating a vector diagram. 

So I have learnt how to plot the vector diagram and I have been getting the correct results however the graph I am trying to replicate has some sort of limit within the range they are using which changes the direction of the vector. I was hoping to get this result, but I don't know how to achieve it. Could anyone point me to the right direction please.

Graph I want to replicate (i've highlighted the section that I want to achieve), what I get.

I look forward to your replies.

Thank you in advance