5. Now you can drag in an RGB Merge node and attach each of the three Curve nodes to it.
6. We're now going to add a sepia-ish tint, so drag in a Color node and make it a suitable colour:
7. Now drag in an Add node so that we can mix in our colour with our adjusted RGB channels. Attach the RGB Merge node to one side, and the Color node to the other side.
Adjust the parameters of the Add node so that you give more bias to the RGB Merge node:
Our preview should now look like it's getting close to what we want:
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