Contour Histogram

{
  "data": [
    {
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"y":[],
      "mode": "markers",
      "name": "points",
      "marker": {
        "color": "rgb(33, 37, 39)",
        "size": 2,
        "opacity": 0.4
      },
      "type": "scatter"
    },
    {
"x" :[],
"y":[],
      "name": "density",
      "ncontours": 20,
      "colorscale": [
        [
          0,
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        ],
        [
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        ],
        [
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        ],
        [
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        ],
        [
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        ],
        [
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        ],
        [
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        ],
        [
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        ],
        [
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        ]
      ],
      "reversescale": false,
      "showscale": false,
      "type": "histogram2dcontour",
      "xbingroup": "X",
      "ybingroup": "Y",
      "contours": {
        "start": 5,
        "end": 75,
        "size": 5,
        "coloring": "heatmap"
      },
      "autocontour": true,
      "autocolorscale": false
    },
    {
"x" :[],
      "name": "x density",
      "marker": {
        "color": "rgb(18, 94, 126)",
        "line": {
          "color": "rgb(255, 255, 255)",
          "width": 1
        }
      },
      "yaxis": "y2",
      "type": "histogram",
      "bingroup": "X"
    },
    {
"y":[],
      "name": "y density",
      "marker": {
        "color": "rgb(18, 94, 126)",
        "line": {
          "width": 1,
          "color": "rgb(255, 255, 255)"
        }
      },
      "xaxis": "x2",
      "type": "histogram",
      "bingroup": "Y",
      "orientation": "h"
    }
  ],
  "layout": {
    "showlegend": false,
    "width": 600,
    "height": 550,
    "margin": {
      "t": 50
    },
    "xaxis": {
      "domain": [
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      ],
      "zeroline": false,
      "showgrid": false,
      "type": "linear",
      "range": [
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      "autorange": true
    },
    "yaxis": {
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      "type": "linear",
      "range": [
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      "autorange": true
    },
    "xaxis2": {
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      "zeroline": false,
      "range": [
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      "autorange": true
    },
    "yaxis2": {
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      "range": [
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      "autorange": true
    },
    "hovermode": "closest",
    "colorway": null,
    "mapbox": {
      "style": "open-street-map"
    },
    "colorscale": {
      "sequential": [
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  },
  "frames": []
}