{
            "classes": [       ],
            currentLayout: 'initialLayout',
            layouts: [{
              name: 'initialLayout',
              panels: [
                  ['title'],
                  ['sub1', 'sub2','sub3'],
                  ['legend']
                  
              ]
            }],
            "gutter": 10,
            "variables": [
            ],
            "panels": [
            {
              "id": "title",
              "url": "title.svg",
             },
            {
              "id": "legend",
              "url": "minardlegend.svg",
             },
             
             {
              "id": "sub1",
              "url": "minard2.svg"
             },
             {
                "id": 'sub2',
                "url": "minard3.svg"
               },
               {
                "id": 'sub3',
                "url": "minard4.svg"
               }
            ],
            "operations": [ 
               {
                  "operation": 'zoom', 
                  "trigger": "zoom",
                  'element': "sub1",
                  'linked': ['map1', 'map2', 'map3']
               },
               {
                  "operation": 'zoom', 
                  "trigger": "zoom",
                  'element': "sub2",
                  'linked': ['map1', 'map2', 'map3']
               },
               {
                  "operation": 'zoom', 
                  "trigger": "zoom",
                  'element': "sub3",
                  'linked': ['map1', 'map2', 'map3']
               }
        ]
    }