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          'source-layer': 'units',
          minzoom: 10,
          maxzoom: 16,
          paint: {
            'line-width': 0.3,
            'line-color': '#555555',
            'line-width': {
              'stops': [
                [10, 0.3],
                [16, 1.2],
              ]
            }
          }
        },
        {
          id: 'large_lines',
          type: 'line',
          source: 'burwell_large',
          'source-layer': 'lines',
          minzoom: 10,
          maxzoom: 