You can create a second emotion curve by choosing in the episode editor second emotions. Per episode you can choose two emotions, when you have a premium subscription.
Tip: you can choose a second emotion that is equal to the first emotion in one episode, to visualize the emotion curve as a complete curve, so that the emotion curve from the second emotions is connected to the emotion curve with the first emotions. You build it like this:
Per touchpoint you can select one emotion.