Barrier potential representation

[PhysicalProof]

Having trouble drawing the wave representations for this diagram.

http://img156.imageshack.us/img156/94/diag.png

I'm not sure what the incident and reflected waves should look like.

The question is asking to draw the waves in each region. I understand how to calculate the waves just not how to represent them.

Any help appreciated thanks.

EDIT: I also understand that the wavelength must be smaller in the middle. What I'm unsure of is where exactly to draw the reflected waves.

[vela]

Reflections occur when there's a change in the potential, so there are two places a reflection can occur.

[PhysicalProof]

Reflections occur when there's a change in the potential, so there are two places a reflection can occur.

Yes but how do I depict these reflections? Are they above or below the waves at E ?

[vela]

They're at E. They have the same total energy as the incident wave.