diff --git a/contrib/charts/area_density_stacked.vl.json b/contrib/charts/area_density_stacked.vl.json
new file mode 100644
index 0000000000..1a3667677b
--- /dev/null
+++ b/contrib/charts/area_density_stacked.vl.json
@@ -0,0 +1,22 @@
+{
+  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
+  "title": "{{ header }}",
+  "width": 400,
+  "height": 80,
+  "data": {
+    "url": "data/penguins.json"
+  },
+  "mark": "area",
+  "transform": [
+    {
+      "density": "{{ x }}",
+      "groupby": ["Species"],
+      "extent": [2500, 6500]
+    }
+  ],
+  "encoding": {
+    "x": {"field": "value", "type": "quantitative", "title": "{{ title_x }}"},
+    "y": {"field": "density", "type": "quantitative", "stack": "zero"},
+    "color": {"field": "{{ field_x }}", "type": "nominal"}
+  }
+}
diff --git a/contrib/charts/area_density_stacked.vl.json.svg b/contrib/charts/area_density_stacked.vl.json.svg
new file mode 100644
index 0000000000..9b90000f2a
--- /dev/null
+++ b/contrib/charts/area_density_stacked.vl.json.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" class="marks" width="578" height="144" viewBox="0 0 578 144"><rect width="578" height="144" fill="white"/><g fill="none" stroke-miterlimit="10" transform="translate(67,27)"><g class="mark-group role-frame root" role="graphics-object" aria-roledescription="group mark container"><g transform="translate(0,0)"><path class="background" aria-hidden="true" d="M0.5,0.5h400v80h-400Z" stroke="#ddd"/><g><g class="mark-group role-axis" aria-hidden="true"><g transform="translate(0.5,80.5)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-rule role-axis-grid" pointer-events="none"><line transform="translate(0,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(50,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(100,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(150,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(200,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(250,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(300,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(350,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(400,-80)" x2="0" y2="80" stroke="#ddd" stroke-width="1" opacity="1"/></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-group role-axis" aria-hidden="true"><g transform="translate(0.5,0.5)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-rule role-axis-grid" pointer-events="none"><line transform="translate(0,80)" x2="400" y2="0" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(0,40)" x2="400" y2="0" stroke="#ddd" stroke-width="1" opacity="1"/><line transform="translate(0,0)" x2="400" y2="0" stroke="#ddd" stroke-width="1" opacity="1"/></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-group role-axis" role="graphics-symbol" aria-roledescription="axis" aria-label="X-axis titled 'Body Mass (g)' for a linear scale with values from 2,500 to 6,500"><g transform="translate(0.5,80.5)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-rule role-axis-tick" pointer-events="none"><line transform="translate(0,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(50,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(100,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(150,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(200,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(250,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(300,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(350,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(400,0)" x2="0" y2="5" stroke="#888" stroke-width="1" opacity="1"/></g><g class="mark-text role-axis-label" pointer-events="none"><text text-anchor="start" transform="translate(0,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">2,500</text><text text-anchor="middle" transform="translate(50,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="0">3,000</text><text text-anchor="middle" transform="translate(100,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">3,500</text><text text-anchor="middle" transform="translate(150,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="0">4,000</text><text text-anchor="middle" transform="translate(200,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">4,500</text><text text-anchor="middle" transform="translate(250,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="0">5,000</text><text text-anchor="middle" transform="translate(300,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">5,500</text><text text-anchor="middle" transform="translate(350,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="0">6,000</text><text text-anchor="end" transform="translate(400,15)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">6,500</text></g><g class="mark-rule role-axis-domain" pointer-events="none"><line transform="translate(0,0)" x2="400" y2="0" stroke="#888" stroke-width="1" opacity="1"/></g><g class="mark-text role-axis-title" pointer-events="none"><text text-anchor="middle" transform="translate(200,30)" font-family="sans-serif" font-size="11px" font-weight="bold" fill="#000" opacity="1">Body Mass (g)</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-group role-axis" role="graphics-symbol" aria-roledescription="axis" aria-label="Y-axis titled 'density' for a linear scale with values from 0.0000 to 0.0020"><g transform="translate(0.5,0.5)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-rule role-axis-tick" pointer-events="none"><line transform="translate(0,80)" x2="-5" y2="0" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(0,40)" x2="-5" y2="0" stroke="#888" stroke-width="1" opacity="1"/><line transform="translate(0,0)" x2="-5" y2="0" stroke="#888" stroke-width="1" opacity="1"/></g><g class="mark-text role-axis-label" pointer-events="none"><text text-anchor="end" transform="translate(-7,83)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">0.000</text><text text-anchor="end" transform="translate(-7,43)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">0.001</text><text text-anchor="end" transform="translate(-7,3)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">0.002</text></g><g class="mark-rule role-axis-domain" pointer-events="none"><line transform="translate(0,80)" x2="0" y2="-80" stroke="#888" stroke-width="1" opacity="1"/></g><g class="mark-text role-axis-title" pointer-events="none"><text text-anchor="middle" transform="translate(-51,40) rotate(-90) translate(0,-2)" font-family="sans-serif" font-size="11px" font-weight="bold" fill="#000" opacity="1">density</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-group role-scope pathgroup" role="graphics-object" aria-roledescription="group mark 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fill="#f58518"/></g></g><path class="foreground" aria-hidden="true" d="" display="none"/></g><g transform="translate(0,0)"><path class="background" aria-hidden="true" d="M0,0h400v80h-400Z"/><g><g class="mark-area role-mark marks" role="graphics-object" aria-roledescription="area mark container"><path aria-label="Body Mass (g): 2500; density: 1.60574227996e-16; Species: Gentoo" role="graphics-symbol" aria-roledescription="area mark" 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fill="#e45756"/></g></g><path class="foreground" aria-hidden="true" d="" display="none"/></g></g><g class="mark-group role-legend" role="graphics-symbol" aria-roledescription="legend" aria-label="Symbol legend titled 'Species' for fill color with 3 values: Adelie, Chinstrap, Gentoo"><g transform="translate(418,0)"><path class="background" aria-hidden="true" d="M0,0h88v53h-88Z" pointer-events="none"/><g><g class="mark-group role-legend-entry"><g transform="translate(0,16)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-group role-scope" role="graphics-object" aria-roledescription="group mark container"><g transform="translate(0,0)"><path class="background" aria-hidden="true" d="M0,0h88v11h-88Z" pointer-events="none" opacity="1"/><g><g class="mark-symbol role-legend-symbol" pointer-events="none"><path transform="translate(6,6)" d="M5,0A5,5,0,1,1,-5,0A5,5,0,1,1,5,0" fill="#4c78a8" stroke-width="1.5" opacity="1"/></g><g class="mark-text role-legend-label" pointer-events="none"><text text-anchor="start" transform="translate(16,9)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">Adelie</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g><g transform="translate(0,13)"><path class="background" aria-hidden="true" d="M0,0h88v11h-88Z" pointer-events="none" opacity="1"/><g><g class="mark-symbol role-legend-symbol" pointer-events="none"><path transform="translate(6,6)" d="M5,0A5,5,0,1,1,-5,0A5,5,0,1,1,5,0" fill="#f58518" stroke-width="1.5" opacity="1"/></g><g class="mark-text role-legend-label" pointer-events="none"><text text-anchor="start" transform="translate(16,9)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">Chinstrap</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g><g transform="translate(0,26)"><path class="background" aria-hidden="true" d="M0,0h88v11h-88Z" pointer-events="none" opacity="1"/><g><g class="mark-symbol role-legend-symbol" pointer-events="none"><path transform="translate(6,6)" d="M5,0A5,5,0,1,1,-5,0A5,5,0,1,1,5,0" fill="#e45756" stroke-width="1.5" opacity="1"/></g><g class="mark-text role-legend-label" pointer-events="none"><text text-anchor="start" transform="translate(16,9)" font-family="sans-serif" font-size="10px" fill="#000" opacity="1">Gentoo</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-text role-legend-title" pointer-events="none"><text text-anchor="start" transform="translate(0,9)" font-family="sans-serif" font-size="11px" font-weight="bold" fill="#000" opacity="1">Species</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g><g class="mark-group role-title"><g transform="translate(200,-22)"><path class="background" aria-hidden="true" d="M0,0h0v0h0Z" pointer-events="none"/><g><g class="mark-text role-title-text" role="graphics-symbol" aria-roledescription="title" aria-label="Title text 'Distribution of Body Mass of Penguins'" pointer-events="none"><text text-anchor="middle" transform="translate(0,10)" font-family="sans-serif" font-size="13px" font-weight="bold" fill="#000" opacity="1">Distribution of Body Mass of Penguins</text></g></g><path class="foreground" aria-hidden="true" d="" pointer-events="none" display="none"/></g></g></g><path class="foreground" aria-hidden="true" d="" display="none"/></g></g></g></svg>
\ No newline at end of file
diff --git a/contrib/charts/area_density_stacked.vl.json.svg.export.png b/contrib/charts/area_density_stacked.vl.json.svg.export.png
new file mode 100644
index 0000000000..08fc54b541
Binary files /dev/null and b/contrib/charts/area_density_stacked.vl.json.svg.export.png differ
diff --git a/contrib/charts/penguins.json b/contrib/charts/penguins.json
new file mode 100644
index 0000000000..517b6d3267
--- /dev/null
+++ b/contrib/charts/penguins.json
@@ -0,0 +1,3098 @@
+[
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 39.1,
+    "Beak Depth (mm)": 18.7,
+    "Flipper Length (mm)": 181,
+    "Body Mass (g)": 3750,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 39.5,
+    "Beak Depth (mm)": 17.4,
+    "Flipper Length (mm)": 186,
+    "Body Mass (g)": 3800,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 40.3,
+    "Beak Depth (mm)": 18,
+    "Flipper Length (mm)": 195,
+    "Body Mass (g)": 3250,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": null,
+    "Beak Depth (mm)": null,
+    "Flipper Length (mm)": null,
+    "Body Mass (g)": null,
+    "Sex": null
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 36.7,
+    "Beak Depth (mm)": 19.3,
+    "Flipper Length (mm)": 193,
+    "Body Mass (g)": 3450,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 39.3,
+    "Beak Depth (mm)": 20.6,
+    "Flipper Length (mm)": 190,
+    "Body Mass (g)": 3650,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 38.9,
+    "Beak Depth (mm)": 17.8,
+    "Flipper Length (mm)": 181,
+    "Body Mass (g)": 3625,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 39.2,
+    "Beak Depth (mm)": 19.6,
+    "Flipper Length (mm)": 195,
+    "Body Mass (g)": 4675,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 34.1,
+    "Beak Depth (mm)": 18.1,
+    "Flipper Length (mm)": 193,
+    "Body Mass (g)": 3475,
+    "Sex": null
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 42,
+    "Beak Depth (mm)": 20.2,
+    "Flipper Length (mm)": 190,
+    "Body Mass (g)": 4250,
+    "Sex": null
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 37.8,
+    "Beak Depth (mm)": 17.1,
+    "Flipper Length (mm)": 186,
+    "Body Mass (g)": 3300,
+    "Sex": null
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 37.8,
+    "Beak Depth (mm)": 17.3,
+    "Flipper Length (mm)": 180,
+    "Body Mass (g)": 3700,
+    "Sex": null
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 41.1,
+    "Beak Depth (mm)": 17.6,
+    "Flipper Length (mm)": 182,
+    "Body Mass (g)": 3200,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 38.6,
+    "Beak Depth (mm)": 21.2,
+    "Flipper Length (mm)": 191,
+    "Body Mass (g)": 3800,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 34.6,
+    "Beak Depth (mm)": 21.1,
+    "Flipper Length (mm)": 198,
+    "Body Mass (g)": 4400,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 36.6,
+    "Beak Depth (mm)": 17.8,
+    "Flipper Length (mm)": 185,
+    "Body Mass (g)": 3700,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 38.7,
+    "Beak Depth (mm)": 19,
+    "Flipper Length (mm)": 195,
+    "Body Mass (g)": 3450,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 42.5,
+    "Beak Depth (mm)": 20.7,
+    "Flipper Length (mm)": 197,
+    "Body Mass (g)": 4500,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 34.4,
+    "Beak Depth (mm)": 18.4,
+    "Flipper Length (mm)": 184,
+    "Body Mass (g)": 3325,
+    "Sex": "FEMALE"
+  },
+  {
+    "Species": "Adelie",
+    "Island": "Torgersen",
+    "Beak Length (mm)": 46,
+    "Beak Depth (mm)": 21.5,
+    "Flipper Length (mm)": 194,
+    "Body Mass (g)": 4200,
+    "Sex": "MALE"
+  },
+  {
+    "Species": "Adelie",
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+]
\ No newline at end of file