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   "legend": [
    {
     "label": "三类苗（15.18%，118418.26亩）",
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    },
    {
     "label": "二类苗（43.05%，335899.23亩）",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAG5JREFUOI1jYaAyYIEx2NnZGygx6OfPnw1wA9nZ2RtKUn7WK8qSZ9iJCwwMi9ezM/z8+bMB7kJFWQYGc2PyXbh4PYRmwa+MdDBq4KiBowYOMwNPXCDfkPuP0Qz8+fNnw+L17PAiiByAUsAiC1AKANVSIBDobB+HAAAAAElFTkSuQmCC",
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    {
     "label": "一类苗（36.39%，283869.62亩）",
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    },
    {
     "label": "旺苗（5.38%，41985.95亩）",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAGxJREFUOI3t1KEOgDAMBNATS+onlqDhS/gx+oP7gskJEgT+HIqG2W6K7FRT8XLqAgYnvIeIaA9EUg0UEeW+HUjRp5UTkitIqjVEisC6+CvmCms4MhOc4AT/BpbTr1x3C5JUydUmyJNmYL+P3jzBLCEmyca64AAAAABJRU5ErkJggg==",
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