Each bubble represents a topic. The larger the bubble, the higher percentage of the number of documents in the corpus is about that topic.
Blue bars represent the overall frequency of each word in the corpus. If no topic is selected, the blue bars of the most frequently used words will be displayed.
Red bars give the estimated number of times a given term was generated by a given topic.
The further the bubbles are away from each other, the more different they are.
The λ slider allows to rank the terms according to term relevance.
By default, the terms of a topic are ranked in decreasing order according their topic-specific probability ( λ = 1 ). Moving the slider allows to adjust the rank of terms based on relevance for the specific topic.