How to remove the display of the upper border of the chart grid in ngx-echarts?

I am trying to create a beautiful chart to visualize the dynamics of school students' performance.

I am using Angular version 17.3.0, ECharts version 5.5.1, and ngx-echarts version 17.2.0.

I have this config:

{
grid: {
left: 20,
right: 25,
top: 0,
bottom: 40,
},
xAxis: {
type: 'category',
data: [
'9 фев',
'16 фев',
'23 фев',
'1 мар',
'8 мар',
'15 мар',
'22 мар',
'29 мар',
'5 апр',
'12 апр',
],
boundaryGap: false,
axisLabel: {
interval: 0,
overflow: 'truncate',
color: '#86909C',
fontSize: 14,
fontWeight: 'normal',
margin: 10,
formatter: (value: string) => {
const [day, month] = value.split(' ');
return `{a|${day}}\n{b|${month}}`;
},
rich: {
a: {
fontSize: 14,
align: 'center',
},
b: {
fontSize: 14,
align: 'center',
},
},
},
axisLine: {
show: false,
},
axisTick: {
show: false,
},
splitLine: {
show: true,
lineStyle: {
type: 'dashed',
},
},
},
yAxis: {
type: 'value',
min: 1,
max: 6,
interval: 1,
position: 'right',
splitLine: {
show: true,
lineStyle: {
type: 'solid',
},
},
axisLabel: {
color: '#0B1F33',
fontSize: 16,
fontWeight: 'bold',
margin: 12,
formatter: (value: number) => {
if (value < 2 || value > 5) {
return '';
} else {
return value.toString();
}
},
},
},
series: [
{
name: 'Test',
type: 'line',
smooth: true,
data: [null, 4, null, null, 4.57, 5, 4],
connectNulls: true,
emphasis: {
focus: 'series',
},
itemStyle: {
color: '#0E69D5',
borderColor: '#ffffff',
borderWidth: 1,
},
lineStyle: {
color: '#185AC5',
},
symbol: 'circle',
symbolSize: 7,
markLine: {
symbol: 'none',
tooltip: { show: false },
label: { show: false },
data: [
{
xAxis: 6,
lineStyle: {
color: '#0E69D5',
width: 1,
type: 'solid',
},
emphasis: {
disabled: true,
},
},
],
},
areaStyle: {
color: {
type: 'linear',
x: 0,
y: 0,
x2: 0,
y2: 1,
colorStops: [
{ offset: 0, color: 'rgba(192, 216, 253, 0.80)' },
{ offset: 1, color: 'rgba(237, 247, 255, 0.08)' },
],
},
},
},
],
}



This is how it looks: How can I hide the line I marked in red? Or is this impossible to do with ECharts? If it’s impossible, could you please recommend other libraries?

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