雷达图轴线线性渐变echarts radar配置项内容和展示

雷达图轴线线性渐变如何统一从内到外，而不是如图这种，x,y,x2,y2是什么含义

      option = {
    title: {
        text: '基础雷达图'
    },
    tooltip: {},
    legend: {
        data: ['预算分配（Allocated Budget）']
    },
    radar: {
        indicator: [
           { name: '客户至上', max: 6500},
           { name: '合规守信', max: 16000},
           { name: '展业能力', max: 30000}
        ],
        center: ['50%', '60%'],
        startAngle: 90,
        radius: '80%',
        splitNumber: 0,
        axisLine: {
            lineStyle: {
                color: {
                    type: 'linear',
                    x: 0,
                    y: 0,
                    x2: 0,
                    y2: 1,
                    colorStops: [{
                        offset: 0.3, color: 'transparent' // 0% 处的颜色
                    }, {
                        offset: 1, color: '#A09EAA' // 100% 处的颜色
                    }],
                    globalCoord: false // 缺省为 false
                }
            }
        },
        splitLine: {
            lineStyle: {
                color: 'transparent'
            }
        }
    },
    color: ['#D9F6F0'],
    series: [{
        name: '预算 vs 开销（Budget vs spending）',
        type: 'radar',
        data : [
            {
                value: [4300, 10000, 28000, 35000, 50000, 19000],
                name: '李玉刚',
                icon: 'circle',
                symbolSize: 0,
                lineStyle: {
                    normal: {
                        color: '#79DFFB'
                    }
                },
                areaStyle: {
                    normal: {
                        color: '#D4EBFF'
                    }
                }
            }
        ]
    }]
};