diff --git a/v1.3.1/README.org b/v1.3.1/README.org
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--- a/v1.3.1/README.org
+++ b/v1.3.1/README.org
@@ -185,6 +185,8 @@ plan is set to the South-West corner of the room.
 
 This simple topology is described in the OwlPS Positioner's
 configuration file [[./owlps-config/room/topology.csv]].
+The file [[./figures/room_panorama_180.jpg]] is a panoramic (180°)
+photograph of the room.
 
 The East wall is a weight-bearing wall made of concrete, whereas the
 others are simple partitions, 9.5 cm thick. The West wall has two doors
diff --git a/v1.3.1/figures/room_panorama_180.jpg b/v1.3.1/figures/room_panorama_180.jpg
new file mode 100644
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Binary files /dev/null and b/v1.3.1/figures/room_panorama_180.jpg differ