Modulated wave: modulation goes from left to right.

This shows a modulated wave (made of many frequencies)that starts from left. The (red curve) is the carrier, and the (blue line) is the modulation. Note how the carriers go towards the PIM-NIM surface but not across it. The modulation crosses the PIM-NIM surface from left to right.
In NIM, the modulations and carriers travel in opposite direction because this wave is incident perpendicular to the surface. However, this is not true when the wave is incident at an angle. Also, here the decay of the modulation after entering NIM is artificially suppressed. You will see both effects in later movies.

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