To generate a lexical growth curve, pick which annotation you wish to apply it to (by default: just words),
and the token interval at which you want to plot the number of cumulative types overserved.
If you request a lexical growth curve with the same annotation and interval as one which already exists,
it will not be recreated.
Select the annotation on which to build a lexical growth curve:
Select your preferred interval (a good value is 1 thousandth the size of the corpus)