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diff --git a/report/paper.md b/report/paper.md
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@@ -13,7 +13,8 @@ Caltech dataset.
 
 The number of clusters or the number of centroids determine the vocabulary size.
 
-![Bag-of-words histogram](fig/km-histogram.pdf)
+![Bag-of-words Training histogram](fig/km-histogram.pdf)
+![Bag-of-words Testing histogram](fig/km-histtest.pdf)
 
 ## Bag-of-words histograms of example training/testing images