Why does a coil's EMF graph differ from a Hall probe graph at constant speed?

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Jamessamuel
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I seem to have a fundamental misunderstanding of the principle here.
Diagram of a horseshoe magnet with a dashed line XY between its poles and a Hall probe above it, next to an empty graph axis of E against t marked coil enters magnetic field and coil leaves magnetic field.

in the previous part it was required to sketch the graph for the hall probe. I knew since the speed was constant the field was cut at a constant rate hence a straight line was needed. However I did not understand why it dropped off sharply towards the end.

For the part shown in the image, I do not understand what is different about the coil graph from the probe graph. Surely the same logic applies, same rate of movement hence same EMF? Why would the coil be different?
 

Discussion

Look under 2. relevant equations to see what the emf is.
What does a Hall probe measure ?

(Uh-Oh, did you erase the template :)) ?)
 
What do the induced emf in a coil depend on?
Any law come to mind?
Formulas?
How is the magnetic field of the setup configured?