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To adjust the line weight (or line width) in Echarts based on the data, you can use a data-driven approach by mapping the line weight to a data value.

One way to do this is to use the lineStyle option for the series in Echarts and set the width property to a function that returns a value based on the data. For example, if you have a series of data with values ranging from 0 to 100, you can set the line width to increase gradually as the data value increases.

Here is an example code snippet that demonstrates how to adjust the line weight based on the data in Echarts:

option = {
  xAxis: {
    type: 'category',
    data: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul']
  },
  yAxis: {
    type: 'value'
  },
  series: [{
    data: [10, 20, 30, 40, 50, 60, 70],
    type: 'line',
    lineStyle: {
      width: function(data) {
        return data * 2; // multiply line width by the data value
      }
    }
  }]
};

In this example, the line width is set to double the data value using the function(data) { return data * 2 } code. You can customize the line width calculation to fit your specific needs.