Plot the f vs. delta plot, then wait for the user to select centers of clusters by left clicking the points. In general points with both large f and large delta are good candidates of cluster centroids. Selected centers are highlighted. Press ESC to end the selection.

1 | ```
FindClustersManual(distm, f, delta)
``` |

`distm` |
distance matrix. |

`f` |
vector of local densities f(x). Same length of the number of observations. |

`delta` |
vector of distances to the closest high ground delta(x). Same length of the number of observations. |

a list of the following items:

clusters Cluster assignments. A vector of the same length as the number of observations.

centers: Indices of the clustering centers.

silhouette: Silhouette score from the final clustering result.

nclust: Number of clusters.

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