What is 'By Channel' under the Conversation Timeline?

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Conversation Timeline by Channel displays the number and type of monthly conversations that have taken place for the particular deal via various conversation mediums such as Phone Calls, Email Campaigns, Chats, Documents, Meetings, and Web Activity. They are represented in different color codes as shown below.
For instance, let us consider Channel Emails. The color code for Emails is blue. Hence the vertical blue bars represent the email conversations that have occurred for the particular deal.
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Clicking on a vertical bar will display the Channel, subject of the email, along with Other details and Sentiment if available for the same as shown.
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Clicking on the email subject will direct you to the particular email conversation.
The same procedure is applicable to all the other categories such as Phone Calls, Email Campaigns, Chats, Documents, Meetings, and Web Activity.