In the Lemmata table:

The Lemma column lists all the lemmata that have been identified on the basis of the underlying corpus in the process of linguistic analysis. We will provide more information on the definition of a lemma later. Currently, a lemma is only represented by a headword, i.e., an uninflected form that may or may not occur in the corpus itself (but of which inflected variants do occur). For example, the lemma reich represents the adjective reich (with all its inflectional forms), while the lemma Reich represents the noun Reich (with all its forms).

In the Annotated types table:

The Lemma column names the lemma that has been associated with the type in the same row.

Data type:

Data type
Data subtype
Query operators
eq, regex
Null value
no null value

Available in tables:

Also, in the annotated type ngrams tables, you can use this filter on any of the components: