diff --git a/deploy/historisation/grafana/dashboards/nuit.json b/deploy/historisation/grafana/dashboards/nuit.json
index ec9db35..72d9d09 100644
--- a/deploy/historisation/grafana/dashboards/nuit.json
+++ b/deploy/historisation/grafana/dashboards/nuit.json
@@ -760,9 +760,88 @@
         ]
       },
       "options": {
-        "mapping": "auto",
+        "mapping": "manual",
         "series": [
-          {}
+          {
+            "frame": {
+              "matcher": {
+                "id": "byIndex",
+                "options": 0
+              }
+            },
+            "x": {
+              "matcher": {
+                "id": "byName",
+                "options": "Soiree"
+              }
+            },
+            "y": {
+              "matcher": {
+                "id": "byName",
+                "options": "Nuit sans voiture"
+              }
+            }
+          },
+          {
+            "frame": {
+              "matcher": {
+                "id": "byIndex",
+                "options": 0
+              }
+            },
+            "x": {
+              "matcher": {
+                "id": "byName",
+                "options": "Soiree"
+              }
+            },
+            "y": {
+              "matcher": {
+                "id": "byName",
+                "options": "Nuit avec voiture"
+              }
+            }
+          },
+          {
+            "frame": {
+              "matcher": {
+                "id": "byIndex",
+                "options": 0
+              }
+            },
+            "x": {
+              "matcher": {
+                "id": "byName",
+                "options": "Soiree"
+              }
+            },
+            "y": {
+              "matcher": {
+                "id": "byName",
+                "options": "Regression"
+              }
+            }
+          },
+          {
+            "frame": {
+              "matcher": {
+                "id": "byIndex",
+                "options": 0
+              }
+            },
+            "x": {
+              "matcher": {
+                "id": "byName",
+                "options": "Soiree"
+              }
+            },
+            "y": {
+              "matcher": {
+                "id": "byName",
+                "options": "Ce soir (prevu)"
+              }
+            }
+          }
         ],
         "legend": {
           "showLegend": true,
diff --git a/tools/gen-grafana-dashboards.py b/tools/gen-grafana-dashboards.py
index 820fdd1..6595fe6 100644
--- a/tools/gen-grafana-dashboards.py
+++ b/tools/gen-grafana-dashboards.py
@@ -276,7 +276,14 @@ NUIT_XY = {"type": "xychart", "title": "Soiree contre nuit : le nuage des nuits"
       {"matcher": {"id": "byName", "options": "Ce soir (prevu)"},
        "properties": [{"id": "color", "value": {"mode": "fixed", "fixedColor": "red"}},
                       {"id": "custom.pointSize", "value": {"fixed": 18}}]}]},
-  "options": {"mapping": "auto", "series": [{}],
+  # Mapping MANUEL, quatre series sur la MEME trame (index 0). L'automatique
+  # n'affichait que la premiere colonne Y (28/09, capture du proprietaire) ; la
+  # premiere version, une trame par requete, affichait « Err ».
+  "options": {"mapping": "manual",
+    "series": [{"frame": {"matcher": {"id": "byIndex", "options": 0}},
+                "x": {"matcher": {"id": "byName", "options": "Soiree"}},
+                "y": {"matcher": {"id": "byName", "options": n}}}
+               for n in ["Nuit sans voiture", "Nuit avec voiture", "Regression", "Ce soir (prevu)"]],
     "legend": {"showLegend": True, "displayMode": "list", "placement": "bottom"},
     "tooltip": {"mode": "single", "sort": "none"}}}