In Figure 3, you can see the front side of the heatsink. The fins are firm and with a good gap between them. We can also notice a small auxiliary heatsink on top of the base.
On the cooler side the fins are folded in order to avoid the air to escape – so the air pushed by the fan passes entirely by the heatsink. In Figure 4 you can also see how the heatpipes are very close to each other at the base level.
In Figure 5, you can see the back of the heatsink. You can notice that the heatpipes are not in the same row, thus allowing cool air to better reach them.
In a top view (Figure 6) you can see the position of the heatpipes. The plastic piece aparently has only aesthetics purpose, because it doesn’t cover the tips of the heatpipes. There is support for only one fan. Note how the fins are not "plain": they have a small rugosity, which causes a little turbulence on the airflow, helping the heat transfer process.