series: [{
lineColor:'#000',
color: {
linearGradient: {
x1: 0,
x2: 0,
y1: 0,
y2: 1
},
stops: [
[0, '#ffe1c6'],
[1, '#ffffff']
]
},
data: [12, 25, 18, 45, 35, 60, 48, 32, 48, 24, 56]
}]
Я положил lineColor в attibute, называемый series. Попробуй и скажи мне.