What is 'By Sentiment' under the Conversation Timeline?

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Conversation Timeline by Sentiment displays the Sentiments such as Positive, Neutral, and Negative in the monthly conversations that have taken place for the particular deal. They are also displayed based on the color codes shown above. 
For instance, let us consider the sentiment, Positive. The vertical green bars represent Positive sentiments in the email conversation that have occurred for the particular deal.
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Clicking each vertical bar will display the Channel, subject of the email, along with other r details, and the Sentiment if available for the same.
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Clicking on the email subject will direct you to the particular email conversation and hence the specific Sentiment for the same. 
The same procedure is applicable to the other two sentiments.