Drawing Gapped Cluster Heatmaps with 'ggplot2'
c(person("Ryo", "Sakai", email="ryo@vda-lab.be", role="aut"), person("Evan", "Biederstedt", email="evan.biederstedt@gmail.com", role=c("cre", "aut")))
The gap encodes the distance between clusters and improves
    interpretation of cluster heatmaps. The gaps can be of the same
    distance based on a height threshold to cut the dendrogram. Another
    option is to vary the size of gaps based on the distance between
    clusters.
Ryo Sakai [aut],
  Evan Biederstedt [cre, aut]