Add a single plot baseline

Author: waxlamp

test/image/baselines/zzz_smith_single.png

@@ -0,0 +1,28 @@
+{
+  "data": [
+    {
+      "type": "scattersmith",
+      "re": [0, 0.1, 0.5, 1, 2, 3, 4, 5, 10, 0.1, 0.5, 10],
+      "im": [0, 0.1, 0.5, 1, 2, 3, 4, 5, 10, -0.1, -0.5, -10],
+      "mode": "lines+markers"
+    }
+  ],
+  "layout": {
+    "smith": {
+      "domain": {
+        "x": [0, 0.46],
+        "y": [0.56, 1]
+      },
+      "imaginaryaxis": {
+        "showgrid": false,
+        "showticklabels": false,
+        "visible": true
+      }
+    },
+    "showlegend": true,
+    "paper_bgcolor": "lightgray",
+    "margin": {"t": 40, "b": 40, "r": 40, "l": 40},
+    "width": 800,
+    "height": 800
+  }
+}