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Table A.1

Average silhouette scores and elbow points for each of the clustering experiments are given.

Δλm] # Clusters Silhouette Score Elbow Point
3.2–3.6 2 0.57 4
3.2–3.6 3 0.457 4
3.2–3.6 4 0.328 4
3.2–3.6 5 0.286 4
3.2–3.6 6 0.268 4
3.2–3.6 7 0.271 4

5.95–6.60 2 0.521 4
5.95–6.60 3 0.404 4
5.95–6.60 4 0.306 4
5.95–6.60 5 0.273 4
5.95–6.60 6 0.26 4
5.95–6.60 7 0.212 4

7.25–8.95 2 0.403 5
7.25–8.95 3 0.416 5
7.25–8.95 4 0.420 5
7.25–8.95 5 0.423 5
7.25–8.95 6 0.306 5
7.25–8.95 7 0.228 5

10.90–11.63 2 0.612 4
10.90–11.63 3 0.476 4
10.90–11.63 4 0.469 4
10.90–11.63 5 0.456 4
10.90–11.63 6 0.405 4
10.90–11.63 7 0.397 4

<13.2(a) 2 0.471 5
<13.2 3 0.493 5
<13.2 4 0.349 5
<13.2 5 0.336 5
<13.2 6 0.33 5
<13.2 7 0.33 5

Notes. (a)Here are silhouette scores for the secondary round of clustering applied to the pixels belonging to the cluster from the initial round of clustering that coincides most closely to the atomic PDR.

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