Deciding on cluster size setting in Carrot2

I am using carrot2's STC (Suffix Tree Clustering) algorithm for clustering a bunch of documents. By default, the max number of clusters the algorithm forms is 16. Is there a way to decide the number of clusters generated ?.

Below is the code for invoking STC clusters.

ProcessingResult byDomainClusters = controller.process(documents, null, STCClusteringAlgorithm.class);
List<Cluster> clustersByDomain = byDomainClusters.getClusters();

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